Why does the battery light come on after the alternator is replaced?

This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.

Can a car be switched out with a new battery?

Switched out alternator and battery with new ones but car still dies. : Cartalk Switched out alternator and battery with new ones but car still dies. Hi reddit. I come with a very confusing problem (at least for me who is less experienced).

What to do if your alternator and battery are disconnected?

A crimper, some wire and a couple of terminals later, and things are running solidly again. TL;DR Check your resistance from the alternator to the positive terminal connection of the battery (with the battery disconnected), to see if your charge is getting to the battery.

How can I test my car battery relay?

Assuming all fuses are fine, you can test relays by swapping them with others of the same part number (many vehicles will have two or three of the same relay running various components) or by testing the relay itself via continuity and resistance methods. The following two tabs change content below.

This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.

What should I do if my alternator keeps dying?

The alternator is essentially a generator and it keeps your battery charged while supplying additional electrical power for the other systems in the vehicle. If you have a new alternator and your battery keeps dying on you, then there’s definitely a problem that you’re going to need to look into.

Can a car battery be drained by an alternator?

While you might initially think that any problems with electrical things like lights or radio not working are directly related to the battery, the alternator is actually where most of the power in your vehicle comes from. Consider that if you were to leave the lights of your car on overnight by the next day your battery might be drained completely.

What would cause an alternator fuse to blow?

If it was the fusable link, it is possible that some of the diodes shorted to ground. A third possibility is a mechanic accidentally shorted one of the alternator terminals to ground. The last possibility is the wire from the fuse to the regulator or field terminal shorted to the body of the car.

What causes the alternator warning light to flash?

An alternator that is on its way out may cause this warning light to flash when there is a high demand on the battery. You can always save yourself a lot of trouble by paying attention to warning signs like this and trying to conserve your car’s battery.

What causes the battery light to go out?

Click to expand… Many charging systems put the alternator energizer wire through the light bulb. When the alternator starts charging positive voltage is equal on both sides of the bulb filament and the light goes out.

Is it safe to drive with the alternator warning light on?

Is it safe to drive with the alternator warning light on? When this light is illuminated, your car is still somewhat safe to drive as you will have enough battery power to run the engine.

How do I know if my battery or alternator is bad?

Signs of a bad alternator. If the above steps reveal that the battery is working, it’s time to take a closer look at the alternator. There are certain signs of a bad alternator to look for: While running the car, note the brightness of the interior lights. If the dashboard gradually dims, the alternator is likely at fault.

Why does your battery light keep coming on?

There are a few different reasons why your vehicle’s battery light came on. It could be a problem with your alternator, which recharges your battery while your engine is running. It could also be a wiring issue such as a damaged or disconnected wire affecting your battery.

Why does the battery warning light stay on?

The warning light for the battery will stay on if a fault is detected in the charging system . If this occurs, there are a number of potential causes to check out when troubleshooting. Safety is important whenever working with electrical systems, so check your owner’s manual for general tips.

How do I know if it’s the battery or the alternator?

Check the Alternator. Test the alternator to make sure that it can start up the battery. If the battery is working properly and nothing is wrong with it, then it’s the alternator that will more likely cause a problem. Try to start the engine and listen carefully, if it produces a “whining” sound, it may be the alternator.

What happens when you buy a new alternator?

The mechanic went out of their way and bought a different alternator from a different vendor; installed it and the same problem happened. It would start after a jump then putter out moments later.

Is there a problem with the alternator in Liberty?

Discussion in ‘ Liberty ‘ started by jonahb1987, Jul 10, 2019 . I recently had a breakdown. At first we thought it was the alternator, so I bought a new one. Had it installed at a mechanic and the same problem would happen. After being jumped, it would start but putter out in like 4 minutes.

What happens to power steering after an alternator is replaced?

Usually when brakes pads are replaced and the rotors surfaced, it may make the brakes feel stiff for a while until they wear in, but it shouldn’t impact the power steering at all. The only thing I could think of… Engine sludge?

Why is the battery light still on after a new alternator?

So, now truck has new alternator and battery BUT battery light is still staying on. I had them check both and they said, new battery and alt showing good. I know all of the connections are tight and I checked the fuses inside the truck and all are good.

How can you tell if your alternator is going bad?

The alternator has a pretty tough job. Know the warning signs of a failing alternator and what to do if it goes out. The alternator by itself can be the cause of dimming lights, fading radio, and/or stalling. If the alternator is going bad, you will notice that dashboard lights appear dimmer than usual.

What does the alternator do when the engine is running?

When your engine is running, the alternator charges the battery and supplies power for the vehicle’s electrical systems. There are a lot of electrical accessories and systems in your car, beyond just lights and stereo. Modern cars are loaded with sensors and computers that all require electricity.

How does an alternator charge a car battery?

An alternator charges the battery while the vehicle is running by turning mechanical energy from a spinning pulley into current. The rotor, brushes and other internal parts of an alternator wear out over time, so replacing it is something everyone eventually needs to do.

What happens when you change the battery in a car?

A relatively common “side-effect” of replacing a battery and/or alternator in a car is to have the voltage (battery) warning light come on. This is especially true in late-model vehicles with their more sophisticated internal diagnostic systems. There are usually two things…

The mechanic went out of their way and bought a different alternator from a different vendor; installed it and the same problem happened. It would start after a jump then putter out moments later.

How can I tell if my alternator or battery is OK?

As with most electrical issues, if you know the battery or alternator is OK (because you had it tested), then diagnosis comes down to tracing and testing for continuity from one portion of the circuit (s) involved to the next.

When does the battery warning light go out?

The airbag computer will set a code and turn on the warning light when the system voltage is too high, or too low. The light should go out when the problem is repaired. It may not go out immediately though. You need to have your alternator checked. Right now, all of the electrical devices on your car are drawing from the battery.

Is the battery still on after a new battery?

I chanced it when I needed a new alternator, I got a new alternator from Advance Auto, their Carquest 130 amp one, and it is working fine so far, but has a lifetime warranty. One thing when testing alternators is many times they will test fine for the short test when cold on the test bench, but when hot they won’t charge worth a darn.

Why does the battery light stay on when you start the car?

In case the battery light stays on when you start the car, do not worry. It is usual for the light to power on when you turn the ignition to your vehicle. Usually, the light turns off after some time, but if it stays on even when you are driving, then pay attention.

Why is my car battery light blinking?

A fault with the alternator is probably the main reason for a battery light to flicker. It means your battery has taken over to keep the electronics working. As soon as the output from the alternator drops to a certain fairly low level, the battery light flickers.

What was the problem with my alternator going out?

I was thinking that the problem was probably the alternator and as I was trying to get to my house the instruments began to go out. First the tach, then the speedometer, and then the accelerator pedal was unresponsive. I was able to limp for a little while, but it eventually totally quit.

How much does it cost to replace an alternator and battery?

A $5 fix! Probably will need battery charged or replaced because car has been running directly from it. Sorry U had to unnecessarily replace an alternator. Most people will have U do that as guesswork. Good luck

What should I do if my alternator and battery keep dying?

Long story short, I replaced both the alternator and the battery. I also replaced my MAP and Crank Shaft Sensors. I changed the oil and replaced my main belt as well. The car currently can only be jump started. The alternator is not providing power to the battery according to my volt meter.

When to check the voltage of the alternator?

When investigating a flat battery or other potential issue you should always check the voltage with the engine running to make sure the alternator output is charging the battery sufficiently otherwise your only guessing the battery is at fault – as you found out the fault was elsewhere.

Why does my car battery light keep coming on?

Replaced alternator and battery. When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on.

How does an alternator affect the charging system?

The alternator is at the heart of the charging system of your vehicle. Alternator problems and charging system problems can affect your vehicle in different ways. You may notice: your ALT or CHARGE indicator light comes on, your engine is hard to start and cranks slowly, or doesn’t crank, your battery demands lots of water,

Why is the battery light on on my 4.6L?

Broken wire coming off the alternator. It may not look broken but it could be broke inside the insulation. That was the story with my 4.6L. The battery light would come on and off, wiggled the single grey wire and it would turn the light on and off.

What does a misfire code on a check engine light mean?

Misfires that turn on the check engine light and log a cylinder-specific fault code are the easiest to diagnose. The OBD II system will identify the cylinder (s) that are not contributing their normal dose of power and set a code that corresponds to the firing order. A P0303 code, for example, would tell you that the No. 3 cylinder is misfiring.

Why does the service engine light come on on my Astro?

The reason the fuel additive works for a while (if I’m right) is because it temporarily cleans the injectors. I’ve never had this problem with my Astro, but have experienced it multiple times in other vehicles. The “Service Engine” light would come on because you’re giving the computer a misfire fault.

What to do if your Astro warning light goes off?

If the light does not go off on it’s own then you need to lift a battery cable for about 10 minutes to reset the computer. Be careful and don’t short + to ground with the wrench as you remove and install a cable.

What does it mean when your alternator stops charging the battery?

Indicator Light On. Usually, the first sign that your charging system is in trouble is a “battery,” “ALT,” or “CHARGE” warning light illuminating on your instrument panel while driving. It means that for some reason, the alternator has stopped charging the battery and your car is running on battery power.

What to do if check engine light does not go off?

I know this is a silly answer but the first thing I would check is the gas cap. The vehicle has a sensor for pressure & will give a check engine light if not tight or leaking. Just my 2 cents. If the light does not go off on it’s own then you need to lift a battery cable for about 10 minutes to reset the computer.

Why is the battery light not turning on?

A weak battery or working charging circuit won’t turn on the battery light. Since you pretty much ruled out the alternator I would make sure to check your fuses. IIRC there are 2 fuses for the alternator (will check my diagram later). If your fuse check comes back fine, you likely have either a cluster problem or wiring problem.

When do I need to change my alternator?

If you do not change it soon, you WILL need to change it before winter… Save yourself money, change it now, if you still have enough pocket change to do it. It is quite possible you wore out your old alternator. This new one might also be getting old, so it is best not to stress it.. I agree.

How can I tell if my alternator has a blown fuse?

The easiest way to look at the alternator is to check voltage at the battery. See what DC volts is and check for A/C voltage at the battery (meaning alternator isn’t converting voltage properly). Also check the amperage as well. My guess is you have a blown fuse.

What causes battery light to stay on while charging?

Alternator problems can cause your battery lights to stay on while charging. Some indications of these problems are dim headlights, ‘charge,’ and ‘alt’ indicators light up. The battery needs copious water to operate, hard or slow to crank the engine, and alternator noises.

Why does the battery warning light keep coming on?

If you drive more than twenty or thirty minutes battery light comes on and stays on. After another few minutes all warnings lights flash and all gauges freeze, then power steering goes out and car dies completely. Had new alternator tested and its fine just put new battery in. Do not know what else to do.

What does it mean when your shift light comes on?

If the shift light comes on in your dash that means the computer has stored a faulty code and needs to be checked. That will probably tell you what is draining the battery. I would recommend having a certified technician…

What kind of battery do I need for my Chrysler 300?

If you need a car battery for Chrysler 300, shop the numerous selection of Duralast batteries from AutoZone. Duralast 300 car batteries have best-in-class vent caps, a Solidium™ Weld System and higher cold cranking amps to ensure that you don’t get left out in the cold.

Why does the battery warning light come on after replacing the alternator?

Is the ground fine going to the alternator?

Yes the ground is fine going to the alternator, both battery terminals are cleaned on both ends. At the connector level at the alternator no residue, plug looked fine. On very first event 3 weeks ago, the very first sign of battery being lit up at higway speed, I had both battery terminals with green deposit.

What does it mean when your alternator is not charging?

If the alternator is not charging the battery, you will have a red “ALT” or “charge” sign on your dashboard. This means that your battery is no longer being supplemented for power by the alternator. You will need to recheck the wiring because the light could also be faulty.

Is the battery voltage on both sides of the alternator?

If you clear the codes and the warning comes back lets make sure the fusible links have power on both sides. Here is a guide and the alternator wiring diagrams to help you test and see how the system works. Check the two fusible links in picture they should have battery voltage both sides. The problem may be the PCM but lets run some tests first.

Can a fuse be removed from an alternator?

You can typically remove an alternator fuse with your fingers, but just like with your fuse box, you may have to turn to a screwdriver for help. The goal will be to pry it out of your fuse box without doing any damage to it or to the alternator fuse itself.

Is it possible to change the alternator on a Ford?

Difficult, but not impossible. The post size is different, but not by a huge amount. Way too many people don’t notice the difference and manage to connect them wrong because they have a battery with reversed terminals (usually for a Ford). You don’t need to fully connect and tighten the terminals to damage it.

What should I do if my alternator is not charging?

The alternator normally lasts longer than the battery. There are some easy steps you can go through to check the function of your alternator. Tap the alternator carefully with a hammer while the engine is runnin; if the charging goes back to normal, the coals inside it are worn out.

What happens when the alternator of a car is dead?

The alternator and the car’s battery work hand in hand. A good battery should give you service for the next five years before its lifespan ends. If your battery is dead, then it will not give power to the car’s alternator. The alternator normally lasts longer than the battery.

Is the control wire on my alternator broken?

As to the OP, there have been a couple members who have had problems with the control wire connector. This is the small connector that plugs into the back of the alternator. Check to make sure the wire is not broken.

Why is the generator light on on my car?

The light is on because your alternator is not properly charging. Initially, in the olden days, this light was referred to as the generator light and often had the abbreviation “GEN” on the light itself.

How can I tell if my alternator is working or not?

If you’re not 100% sure, you can use a multimeter, or a voltmeter, to check the current coming from your battery. Attach the positive lead to the positive battery terminal, that’s the red one, and then the negative leave it to the black terminal. With the engine off you should be getting a reading of 12.5 volts on your multimeter.

What happens when the alternator dies on a car?

Because the alternator supplies current to the vehicle’s electrical systems, this is where you’ll notice most that something is amiss. Dead Battery: Your car battery will die without a working alternator to keep it charged. If your battery dies, you should test the battery (free at AutoZone).

What’s the best way to replace an alternator?

Ensure all the bolt and/or nut threads are started and tighten them evenly. On some vehicles, the electrical connections will need to be installed first before permanently tightening the alternator for access reasons. Place the drive belt in position and ‘rotate’ the belt tensioner so the belt can be installed.

Why does Battery Saver mode come on again after replacing battery?

I relaaced my alternator and battery a 3 weeks ago cause the old ones went bad ,and a couple of days ago the battery saver mode pop up again on my dash and turns off my audio that would happen when I had the bad alternator and battery on but I have the new ones in but the message came back My car has 126000 miles.

Do you need a battery for an alternator?

Honestly, you need a battery, but perhaps just a charge will get you by. A weak battery will cost you an alternator (oh yeah, you just bought one) it can cost you a starter and it can cost you a computer.. Charge the battery (FULL charge) and then have them check it.

How can I tell if my alternator is charging the battery?

Use your multimeter (if you don’t have one get one). Turn it to dc volts put your leads on your battery (with the car running), if your alternator is charging it should read from 13.5V-14.5V (thats a good charge). If your not getting a reading from there you can check your output from your alternator.

What happens if you have a new alternator and the battery is not charging?

The alternator in your car is an integral part of your vehicle’s electrical system. If you have a new alternator and the battery is still not charging, then you definitely have some kind of a problem with your battery that you’ll need to address immediately.

Both of these car parts control your electrical system. However, your alternator charges your battery while your battery supplies power to your car. The failures of a battery are sudden, while failures of a failing alternator are slow. Always check your battery first, it can generally tell you which of these two is the culprit.

How can I tell if I have an alternator problem?

To differentiate an alternator problem from the battery, you will need to use a voltmeter to check for voltage. First, turn off the engine and check the battery voltage. A fully charged battery should have a reading of 12.65 volts. Next, turn on the engine and recheck the voltage. You should have a reading of 13.5 to 14.5 volts.

What makes alternator go bad?

Causes of a Bad Alternator. One of the most common problems of a faulty alternator is a loosened belt. The diodes of the alternator can go bad, failing to transmit the required voltage. The bearings on which the alternator rotates can also be at fault and hinder the alternator from providing an optimal performance.

What are the signs of a dead alternator?

The signs of a dying alternator include: Car shutting down shortly after being jumped. Car’s electronic operations (radio, headlights) weaken while driving. Alternator warning light is on. Headlights dimming more than usual.

What happens if the alternator on a Dodge truck is not working?

The alternator on your Dodge, whether it’s a car, truck or van, is an essential piece of its electrical system. In fact, if the alternator is not working perfectly, your Dodge will soon begin to experience serious problems. For example, with an improperly functioning alternator, the battery will quickly drain.

Why is the alternator not working on my car?

It may have damaged your battery. Since the alternator regulates how much electric current gets fed back to the battery during recharging, the battery may have overheated due to overcharging. This shortens its expected life and can make it unreliable.

What causes the alternator light to come on?

The alternator warning light means there is an issue with powering the battery . This could be due to the alternator becoming worn out.

What are signs of needing a new alternator?

Warning Light. Many automobiles have a battery or alternator warning light on the dashboard.
Load Test. Conducting a load test will indicate whether or not your alternator needs to be replaced.
Voltmeter Test. You can test your charging system with a voltmeter.
Other Signs.

What are the signs that my alternator is going out?

One of the most common symptoms of a failing alternator is flickering, pulsating, or dimmed headlights. If your alternator is beginning to fail it won’t be able to power your headlights effectively.

Why does the battery light come on and off?

Last week while driving, for about 3 seconds the battery light flickered on and then off. The voltmeter jumped up and down between high and low. Two days ago, the battery light appeared again and this time it stayed on. The meter kept low and then started dropping lower and lower.

What should I do if my battery light comes on?

Your local parts store will be able to test the alternator on the car, most if not all will do it for free. Based on the battery light I am confident it’s the alternator, but checking it never hurts. If you can change the alternator yourself you may still be able to get one if you act fast.

Why does my battery light keep going out?

It’s the red&green wire. The regulator is located on thr driver side mounted on the inside of the radiator core support.It is easy to change out. Start the car, take off the positive battery cable. If the car dies your alt is toast, if it stays running your alt is fine. Could be a regulator also going out. Check those. Click to expand…

What causes a battery warning light on the dashboard?

See how you can fix the battery warning light on dashboard with this five problem that you can look at. While the battery light might seem like there is a battery problem, but in fact there could be other numerous issue causing the battery light to activate. To see what is really wrong with the car see this video for things you can check.

Can a battery be defective out of the box?

Sometimes, batteries are just not as good as they are manufactured to be due to hidden defects or a longer-than-usual shelf wait before being purchased. Similarly, alternators can be defective out of the box, especially if they’re refurbished or rebuilt.

See how you can fix the battery warning light on dashboard with this five problem that you can look at. While the battery light might seem like there is a battery problem, but in fact there could be other numerous issue causing the battery light to activate. To see what is really wrong with the car see this video for things you can check.

Sometimes, batteries are just not as good as they are manufactured to be due to hidden defects or a longer-than-usual shelf wait before being purchased. Similarly, alternators can be defective out of the box, especially if they’re refurbished or rebuilt.

Why is your new alternator not charging your battery?

The most common reason for an alternator not charging a battery is because of a bad alternator or battery . You can easily test the voltage by connecting a voltmeter to your battery while the engine is off.

Will a car with a bad alternator start with a new battery?

A bad alternator can prevent a car from starting because it did not charge the battery when the car was running. However, even if you have a dead battery because of the alternator, you can still jump-start the car using the following method.

Why is my alternator not charging the battery?

If the alternator is not charging the battery you will have a red “ALT” or “charge” sign on your dashboard. This means that your battery is no longer being supplemented for power by the alternator. You will need to recheck the wiring because the light could also be faulty. Nov 22 2019

How long can a battery last without an alternator?

A good alternator and can last well over a decade, sometimes as long as 15 to 20 years. However, if an alternator does fail on you then you’ll know it fairly quickly as your electrical systems will fail soon afterwards. The charge in your battery does not last long without the alternator there to keep it running properly.

How does an IDJIT light work with an alternator?

The idjit light essentially goes from the alternator output to the battery positive. If all goes well, both terminals are at the same voltage potential and no current flows. If either the battery or alternator are not at the same level, there will be current flow through the light and it will illuminate.

How to troubleshoot an alternator and charging system problem?

If necessary, adjust the belt with the help of your car owner’s manual or repair manual. Inspect the belt for signs of cracks, cuts, shiny spots, deterioration or other signs of wear or damage. Change the belt and belt tensioner at the manufacturer’s recommended interval. 2. Check for Wiring Problems

What should the charge voltage be on an alternator?

Turn on the high beams for 10 seconds and then turn them off. Measure battery voltage across the battery posts with your DMM. You should get between 12.4 and 12.6V. This means your battery is fully charged. If you get a reading below 12.4V, charge the battery before continuing. 5b. Measure the Charging System’s No-Load Voltage

How much does it cost to install an alternator?

The alternator cost will range from $200 to $700 just for the part itself! To have a new alternator fitted at a garage you can expect to pay between $172 to $1046 with an average cost in the mid $500 range, depending on the part used and the model of car you own.The Complete Alternator Replacement Cost Guideautoservicecosts.com/alternator-replacement-cost/

How do you know if the alternator is broken?

Be sure the battery leads are tight before diagnosing battery and alternator problems. If they are loose, they are probably causing your charging problems. If the alternator is broken, you may be able to hear loud clicking sounds coming from the engine while it is running.

Will alternator cause no start?

Charging Problems. The first sign of trouble when an alternator is failing is a low or dead battery. On a late-model vehicle, that can not only cause a no-start but also can cause the loss of “learned” data in the powertrain control module and other modules throughout the vehicle.

What is the average price of an alternator?

However, on average, an alternator can cost anywhere between $200 and $600. Realistically, this means that car owners of your average size car will be paying around $400 for the part itself.

What happens when there is no battery light?

The Alternator cut-in speed is increased if there is no warning light on when in the ignition position Is the warning light coming on as it should with ignition on and no engine running ? Charging light is battery backed.

What does it mean when your abs light comes on?

Most commonly, this light is triggered by low brake fluid or an engaged parking brake. However on some vehicles, it can simply indicate a problem elsewhere in the system and can be illuminated immediately if there is an ABS fault.

What happens when an alternator has an electrical problem?

After the engine starts (thanks to the high voltage provided by the battery), the alternator provides the electricity required to power the car’s many electrical functions, including the lights and radio, the spark, charging the battery, and others. What Happens When Your Car Has an Electrical Problem?

Most commonly, this light is triggered by low brake fluid or an engaged parking brake. However on some vehicles, it can simply indicate a problem elsewhere in the system and can be illuminated immediately if there is an ABS fault.

Where is the sensing wire on an alternator?

The other wire is for the regulator’s “sensing” circuit, which controls the output of the alternator so that it maintains, but does not overcharge, the battery. It’s connected to a 10 Amp fuse in the engine compartment fuse box.

How many volts does an old alternator have?

All the battery connections are tight. The positive and negative side both show minimal ohms and have good connectivity to all portions of the alternator. The old alternator tested good at Autozone. The battery has 11.8 volts now. Turning on the ignition drops that to 11.6.

When does the battery warning light come on?

When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on. After another few minutes all warnings lights flash and all gauges freeze, then power steering goes out and car dies completely.

Is the battery light on but alternator working fine?

Hi the battery light came on the other day although the volts were fine (lights on too) and that was confirmed with a voltmeter on the battery terminals. Alternator swapped and the same results.

Why is the alternator light dim at hiatal?

Usually when this is the case, the light will be very dim at hiatal and will get brighter as you rev the engine. To diagnose the problem, put the positive wire of your volt meter on the alternator output terminal and the negative wire of your volt meter on the battery plus terminal.

When does the alternator turn on the idiot light?

When the engine starts and gets up to a high enough rpm for the alternator to start putting out voltage, there is a diode inside that takes some of the output voltage and featured back to the terminal that goes to the idiot light.

Why is the second alternator Battery Light still on?

Now the second alternator has the battery light on but very dim constantly when engine is running. charging fully ay 14.5. Is the replacement a denso unit or an aftermarket unit? Did you try cleaning your grounds or inspect for broken ground wires?

Honestly, you need a battery, but perhaps just a charge will get you by. A weak battery will cost you an alternator (oh yeah, you just bought one) it can cost you a starter and it can cost you a computer.. Charge the battery (FULL charge) and then have them check it.

How can I tell if my alternator is charging before I change the battery?

Just get a good new battery. You could confirm before and after replacing your alternator that it is in fact charging, by measuring voltage across battery posts while idling. Personally I think you would have been better off buying a $10 volt meter instead of that $10 AEM cold air induction intake.

What does the charge indicator light mean on a car?

Indicator Light On Usually, the first sign that your charging system is in trouble is a “battery,” “ALT,” or “CHARGE” warning light illuminating on your instrument panel while driving. It means that the alternator voltage output is below 12 volts, or over its limit or has stopped charging the battery and your car is running on battery power.

When does the ignition warning light not come on?

If your car is fitted with an alternator the warning light should not come on when the engine is idling, provided the idle setting is correct, because an alternator produces current even at low speeds.

When does the battery light come back on?

The car drove fine and after 10-15 minutes the battery light went off. However when I drove it later on during my drive the light came back on. Why is this does anybody know?

If your car is fitted with an alternator the warning light should not come on when the engine is idling, provided the idle setting is correct, because an alternator produces current even at low speeds.

The Alternator cut-in speed is increased if there is no warning light on when in the ignition position Is the warning light coming on as it should with ignition on and no engine running ? Charging light is battery backed.

Replaced alternator and battery. When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on.

When you start car battery light comes on then goes off, comes on again five minutes later, goes off again. If you drive more than twenty or thirty minutes battery light comes on and stays on. After another few minutes all warnings lights flash and all gauges freeze, then power steering goes out and car dies completely.

Why does the battery light stay on when the alternator is off?

The alternator is definitely charging the battery and does not drain overnight but the battery light continues to stay on. Before spending money to test the fusible links, please advise If the alternator will still charge the battery with a faulty or blown out fusible link? Thanks.

How can I tell if my alternator needs to be replaced?

First check the battery voltage to confirm if it’s the alternator. If it is usually just the voltage regulator needs to be replaced.

When to use the battery or alternator in a car?

Please note, the battery is only used (under normal conditions) to start the vehicle. To turn the engine crank shaft using the starter, the battery must have the amperage (power) to do the job. Once the engine is started, the alternator is the source for all electrical power to the vehicle.

Can a loose alternator belt cause flickering lights?

If this symptom is consistent with the flickering lights issue, then a loose alternator belt is more likely the cause. One of the first symptoms that you should notice is the battery warning light coming on. This warning light does not always mean there is a problem with the battery itself.

How is the alternator belt connected to the battery?

When an alternator is actively charging the battery, it is actually spinning inside the vehicle. There is something called an alternator belt (also called a serpentine belt) which wraps around a pulley or multiple pullies that is connected to the alternator. The other end of the pulley wraps around the crankshaft.

How much does it cost to replace an alternator belt?

Unfortunately, the battery will die within minutes because it doesn’t have enough power to sustain all the vehicle’s energy needs by itself. The replacement cost of an alternator belt is typically between $100 and $200. The part cost is between $25 and $80 while the labor cost is between $75 and $120.

If this symptom is consistent with the flickering lights issue, then a loose alternator belt is more likely the cause. One of the first symptoms that you should notice is the battery warning light coming on. This warning light does not always mean there is a problem with the battery itself.

When an alternator is actively charging the battery, it is actually spinning inside the vehicle. There is something called an alternator belt (also called a serpentine belt) which wraps around a pulley or multiple pullies that is connected to the alternator. The other end of the pulley wraps around the crankshaft.

Unfortunately, the battery will die within minutes because it doesn’t have enough power to sustain all the vehicle’s energy needs by itself. The replacement cost of an alternator belt is typically between $100 and $200. The part cost is between $25 and $80 while the labor cost is between $75 and $120.

What did I do when my alternator died?

I was driving on the freeway and my car started to make a weird noise. Pulled over to the next lane for the next exit. It automatically died and locked up. I kicked it in neutral and forced it onto the shoulder. Roughly a week or two before that I replaced the alternator and it was running great.

What happens when the diodes in an alternator go bad?

Alternators use diodes to rectify alternating current produced by the alternator into direct current. When one or more diodes go bad, the alternator can cause all kinds of problems. AC voltage leak can cause your lights to dim and drain power from your battery, for example.

When does an alternator need to charge the battery?

If the battery voltage is more than 13 volt, if the engine RPM is 2000 and if all the function is running smoothly, that means your alternator is pleasingly charging your car battery. Never make your car alternator culprit all time.

When to know it’s time to replace your alternator?

A “low battery” warning light is often one of the first signs of alternator trouble. It’s important to note that a reduced voltage condition can affect the entire vehicle.

How does an alternator tester work on a car?

First, a battery tester will be used to confirm if the battery is still capable of holding a charge, or if it has dead cells and must be replaced. Once the battery has been either recharged or replaced, the output of the alternator is checked with a multimeter.

What happens if you have a bad alternator in your car?

The car won’t start at all. If the problem is a bad alternator, your car will slowly lose power. You’ll be driving down the road, your lights will dim, and you’ll lose power and die. If the problem is with your battery, then you’ll generally only have trouble starting your car since that’s the battery’s main function.

How to diagnose an alternator or electrical problem?

Diagnosing alternator problems can be a bit tricky because the electrical system in a car comes from two places, the battery and the alternator. I’ll give you a little background so you can understand what both systems do. The battery has one primary function, which is to start the car.

Diagnosing alternator problems can be a bit tricky because the electrical system in a car comes from two places, the battery and the alternator. I’ll give you a little background so you can understand what both systems do. The battery has one primary function, which is to start the car.

The car won’t start at all. If the problem is a bad alternator, your car will slowly lose power. You’ll be driving down the road, your lights will dim, and you’ll lose power and die. If the problem is with your battery, then you’ll generally only have trouble starting your car since that’s the battery’s main function.

The alternator and the car’s battery work hand in hand. A good battery should give you service for the next five years before its lifespan ends. If your battery is dead, then it will not give power to the car’s alternator. The alternator normally lasts longer than the battery.

What to do if your Ford Focus alternator fails?

Check the Blue (BU) wire and the Grey (GY) wire for continuity between the alternator and the Powertrain Control Module (PCM) pin 14 and 15 , as well as for either circuit, indicating a short to ground. If all checks show to be OK, replace the alternator with one from dealership before condemning the PCM for failure.

A “low battery” warning light is often one of the first signs of alternator trouble. It’s important to note that a reduced voltage condition can affect the entire vehicle.

First, a battery tester will be used to confirm if the battery is still capable of holding a charge, or if it has dead cells and must be replaced. Once the battery has been either recharged or replaced, the output of the alternator is checked with a multimeter.

What should my alternator voltage be at rest?

To use a multimeter for testing, set the knob to a number greater than 15 on the DCV (DC volts) section. A fully charged battery at rest should measure between 12.6 and 13.2 volts. With the engine running, the alternator must exceed that voltage at the battery.

Turn on the high beams for 10 seconds and then turn them off. Measure battery voltage across the battery posts with your DMM. You should get between 12.4 and 12.6V. This means your battery is fully charged. If you get a reading below 12.4V, charge the battery before continuing. 5b. Measure the Charging System’s No-Load Voltage

When turning the ignition switch to the on position before starting the engine, all the warning lights come on including the battery light. When the engine is started, the battery light goes out but then comes back at half the brightness. As I may have said before, it’s only noticeable at night.

Is the battery light on but battery charging OK?

Going nuts – Battery light on but battery charging OK. The battery light is on but the voltmeter says 13.5 to 14.5 volts depending on the engine revs. When engine is off the volts drop to about 12.

Is the Dang Battery Light still on in a Toyota?

However, the dang battery light is still dimly lit. When turning the ignition switch to the on position before starting the engine, all the warning lights come on including the battery light. When the engine is started, the battery light goes out but then comes back at half the brightness.

Is the new battery and alternator testing good?

New battery and alternator testing good. Why? My battery light came on awhile ago, so I replaced the battery. It now will come on every and now and then. Just randomly I will be driving and it will come on and then a minute later go off. I have got alternator tested at Autozone and they said it was good. I have also tested it myself.

What does it mean when Battery Light comes on while car is running?

When you first turn on your car with the engine off, the battery light will illuminate and this is normal. If the battery light comes on while the engine is running and the vehicle is being driven, this indicates a problem with the charging system. Step 1: Turn off everything that draws power.

When does a battery charger light come on?

This light illuminates whenever the charging system does not charge the battery with a voltage above approximately 13.5 volts. As this warning may be triggered by a number of things, it is important to take steps to ensure that you know what the actual issue is before replacing any parts.

Broken wire coming off the alternator. It may not look broken but it could be broke inside the insulation. That was the story with my 4.6L. The battery light would come on and off, wiggled the single grey wire and it would turn the light on and off.

What are the symptoms of a bad alternator in a Ford F150?

Here are the most common symptoms of a bad alternator in a Ford F150: The battery light is designed to tell you that there is not enough voltage to properly charge the battery, or that the battery itself is not holding the proper voltage. In rare occasions the service engine soon light may light up.

What happens when you change the battery in a Ford F150?

During this 8 hour period, the vehicle must be undisturbed, with no doors opened or keyless entry buttons pressed. If the vehicle is used before the BCM is allowed to learn the new battery state of charge, engine off load shedding may occur earlier than normal and a message may be displayed.

How much does it cost to replace an alternator in a car?

If you have an awesome audio system, odds are you’ll need a more expensive alternator that puts out more amperage for your car’s electrical needs. In general, expect $130 to $250 for a quality alternator.

Can you drive a car with a faulty alternator?

Faulty diodes can easily be replaced, but you will need to dismantle the alternator. It is impossible to drive the car with a faulty alternator. While it is the work of the battery to power the electrical components in the car, it cannot do this alone.

What happens if the alternator is not working?

The alternator charges your battery while you drive. If your alternator fails, your battery doesn’t charge and eventually dies. How long will a car run without an alternator? If your alternator isn’t working, your car can barely do more than start before you begin losing power.

How long does an alternator last in a car?

On average, car batteries last between 2 and 5 years. Eventually, the level of battery charge diminishes to the point where, no matter how much power the alternator gives to it, the battery can’t hold enough power to start the car.

The alternator charges your battery while you drive. If your alternator fails, your battery doesn’t charge and eventually dies. How long will a car run without an alternator? If your alternator isn’t working, your car can barely do more than start before you begin losing power.

When to know if your alternator or battery is dead?

If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is likely your answer.

How do you replace an alternator in an air conditioner?

Install the replacement alternator on the engine bracket and apply the bolts without tightening them. Slip the alternator drive belt back onto its pulleys–this is also the belt for the air conditioner compressor–and tighten the pivot, lock and adjustment bolts.

Can you remove an alternator from a Sienna?

Because of its large engine compartment, the Sienna’s alternator is simpler to remove compared to smaller vehicles. You should remove the current alternator before acquiring the replacement to make sure you get an exact duplicate alternator and so the shop can transfer the old alternator’s pulley if needed. Disconnect the battery’s negative cable.

A good alternator and can last well over a decade, sometimes as long as 15 to 20 years. However, if an alternator does fail on you then you’ll know it fairly quickly as your electrical systems will fail soon afterwards. The charge in your battery does not last long without the alternator there to keep it running properly.

How does an alternator start and run an engine?

Starting and running an engine, in its simplest form, is a three-step process. First, the battery delivers a jolt of electricity to the starter. This starts the engine running, which puts the alternator into action. Finally, the alternator completes this cycle by charging the battery.

What to do if your battery light comes on again?

Tip: Try starting your car in a safe location, if the battery light comes on again, do not drive it. Shut off the engine and open the hood to see whether the serpentine belt, alternator or battery have any problems that can be identified visually. Tip: Always turn off the engine before inspecting the battery or other components.

What could be wrong if my battery light comes on?

The battery light indicates a battery charging problem. If the battery light comes on and stays on while you are driving, the most common cause is a broken alternator belt. Total failure of the alternator is another possibility.

What might cause the battery light to stay on?
- Poor Battery Condition. The first thing you should check is whether there is a problem with the battery.
- you should move into the alternator.
- Bad Wiring. The wiring that comes out of the battery could be damaged or frayed.
- Bad Battery Cable.
- Losing battery cable.
- Too many Accessories.
- Bad Ground Trap.
  
  Why my battery light keep coming on?
  
  The cause of the battery light could be a loose or corroded battery cable or other wire connecting components of the charging system, or it might be a problem with the alternator or voltage regulator. The alternator generates the power that is stored in the battery.
  
  Can a bad car battery cause an alternator to not charge?
  
  In theory a car can run only with the alternator charge, but this can cause heavy voltage spikes and other strange symptoms so this means that a bad car battery can cause an alternator to not charge also. Cars are increasingly coming with modern electronics.
  
  Where are the warning lights on a Ford F-150?
  
  Notorious liars. Ordered a turbo sensor replacement. Located in front on the intake tube, two silver bolts hold it on the air tube, connector and wiring harness. Check the fuel pump shut off switch. Take a look here:
  
  Is it normal for the battery light to come on then turn off?
  
  Yes! It’s perfectly normal for your car’s battery light to come on then turn off after you start it. Thanks! What do I do if my car is saying it has a low battery? You may need to replace the battery or alternator.
  
  What should I do if my F150 Battery Light is not working?
  
  With a multimeter you do a quick test to see if your F150’s alternator is working or not. The following was taken from bad alternator diagnosis page on this site: Set the multimeter to read voltage. Specifically, you’ll need to set it to 20V DC.
  
  What to do if your F150 battery post is corroded?
  
  If the battery post is really corroded, it won’t be able to do its job of sending the voltage to and from the battery efficiently, and your F150’s battery light will turn on. It only takes a second to check it out. A battery post cleaner or wire brush can clean it up in no time.
  
  How can I tell if my Ford F150 alternator is bad?
  
  You can diagnose whether your F150’s alternator is bad pretty quick at home. If you have a voltage meter, that’s a fantastic place to start. Voltage Test The first thing that you’ll want to do is get a good multimeter. With a multimeter you do a quick test to see if your F150’s alternator is working or not.
  
  What should I do if my alternator fails?
  
  If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system. If the alternator fails, replace it with a new or rebuilt unit and re-test system, if the alternator tests ok proceed to the next step.
  
  How long does an alternator and battery last?
  
  As a battery ages it loses its ability to hold a charge, as a rule of thumb a battery will last about three to four years. If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system.
  
  Where is the alternator on a Ford F-250?
  
  This article applies to the Ford F-150 (2004-2014, and the F-250, F-350 Super Duty (2005-2014). The alternator is located at the front of your engine. It works with your Ford F-150 or F-250 Super Duty’s battery to generate power for your electrical components. Dim lights and flickering gauges are a sign of failing alternator.
  
  What happens when an alternator fails on a Ford truck?
  
  It works with your Ford F-150 or F-250 Super Duty’s battery to generate power for your electrical components. Dim lights and flickering gauges are a sign of failing alternator. When the alternator completely fails, your truck could start slowly or not start at all.
  
  What should voltage be on Ford PowerStroke alternator?
  
  Awesome. Pulled over on the side of the road to make sure no connections had come loose and everything looked okay and I drove home (3 miles). Got home and checked the voltage on the alternator (red lead to threaded stud on back of alternator, black to grounding point on the fender) and it was reading 12v or less.
  
  What kind of battery does a Ford PowerStroke have?
  
  As I pulled away from an intersection at 3/4 throttle, I hit ~3800 rpms and just as the truck was shifting into 3rd gear my battery light came on and stayed on. I looked down at my ScanGaugeII and it was showing 11.8v.
  
  What to do if your alternator is over charging the battery?
  
  Ask an assistant to start the engine and hold engine speed at about 1500 RPM. Measure voltage across the battery with your DMM. You should get 0.5 to 2 volts higher than base voltage. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty.
  
  Why does my alternator get higher than base voltage?
  
  You should get 0.5 to 2 volts higher than base voltage. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring.
  
  How can I tell if my alternator is draining my battery?
  
  Another way to tell if an alternator is draining your battery is by running your car and unplugging the battery’s positive connection. If the car immediately stops running, your alternator has malfunctioned because it should depend on the alternator and not the battery after starting. Another simple way is to test your interior lights.
  
  What should I do if my alternator goes out?
  
  Recheck the smaller wires to the alternator and recheck the battery voltage when the car is off. I would say that the chances of the old alternator “going out” without a peep, and this brand new one both being simultaneously defective is a stretch.
  
  What should the DVM be on an alternator?
  
  *) Red of the DVM on alternator case. In this measurement, you are looking for less than 5mV. Anything more than 5mV and you have poor ground connection between battery and engine. 2018 Outback- Brand new!! 2003 Outback, 4cyl. 290,000 miles and still goin’ strong!!
  
  What does the battery light on the dash mean?
  
  Updated September 30, 2018 If you take a look at your dash when you turn the ignition key—but before you actually start the car—you’ll likely see that one of the lights looks like a little battery with a “+” and “-” sign on it. This is your battery or charging light. Once you start the car, all your dash lights should go off.
  
  Why does the Dashboard Light Come on while driving?
  
  If the dashboard light comes on then stays on while you drive, it’s likely that cause is probably a broken or damaged alternator belt or a complete failure of your alternator. How Can a Car Run Normally Even if the Dashboard Battery Light Is On?
  
  What’s the warranty on a car dashboard light?
  
  If the battery of your car is close to giving out completely, the dashboard light may illuminate at any time. While car batteries have a warranty of 48, 72 or 96 months, they’re unlikely to last for that full length of time.
  
  What happens when the dashboard battery light comes on?
  
  Your car can often run normally even if the dashboard battery light comes on because the car is capable of running off the energy that is already stored in its battery. The car, therefore, carries on running perfectly until its battery runs flat. After that, none of the car’s components will work.
  
  If the battery of your car is close to giving out completely, the dashboard light may illuminate at any time. While car batteries have a warranty of 48, 72 or 96 months, they’re unlikely to last for that full length of time.
  
  What to do if your engine light is not on after battery replacement?
  
  If you followed the correct procedure to replace the battery of your vehicle and the engine light was not on before you replaced the battery all you will have to do is to diagnose the system and reset the engine computer. It could happen to BMW, Mercedes, Audi, and almost any newer vehicle. This happened on our BMW e46.
  
  What to do if your battery light is off?
  
  Visit The Drive ’s guide for How To Clean Battery Terminals for more. Use a multimeter to test the battery for the correct voltage. A fully charged battery should register 12.6 volts or more. If it’s off, try recharging the battery with a trickle charger before replacing it.
  
  What to do when your alternator stops working on your car?
  
  After running the motor for a while, turn the car off. If you can’t get it to restart, this is a sign the alternator is doing its job of keeping the battery working while the motor is running, but the battery isn’t retaining the charge when the alternator has stopped. The car battery could be old.
  
  On average, car batteries last between 2 and 5 years. Eventually, the level of battery charge diminishes to the point where, no matter how much power the alternator gives to it, the battery can’t hold enough power to start the car.
  
  Why is my focus alternator not charging battery?
  
  You yank the back cover and study the diode solder points close, you will almost always have at least one cracked and often more if still using that type diode plate and the alt is giving trouble. Some of the cracks can be very hard to see, the evidence though shows in the charging, they will appear to charge fine but it comes and goes.
  
  Why does my car not start when the alternator is bad?
  
  If your car won’t start, it’s often due to a malfunction of either the battery or the alternator. If it’s one of those two, placing the blame can be relatively simple. Starting and running an engine, in its simplest form, is a three-step process. First, the battery delivers a jolt of electricity to the starter.
  
  If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is likely your answer.
  
  How can you tell if your car charger is in trouble?
  
  Usually, the first sign that your charging system is in trouble is a “battery,” “ALT,” or “CHARGE” warning light illuminating on your instrument panel while driving. It means that for some reason, the alternator has stopped charging the battery and your car is running on battery power.
  
  How does a Battery Charger Charger light work?
  
  Your charging light bulb in the dash gets its power from the 10amp GAUGE fuse. The regulator in the alternator grounds that circuit as necessary to make the light come on. Was the battery light on dim before you installed the new alternator?
  
  How to replace duel batteries on a Ford F Series diesel?
  
  The video’s are intended for information only. Follow the manufactures repair procedure and use appropriate safety procedures . Email [email protected] Jimthecarguy
  
  How to reset adaptive memory on Ford F-150?
  
  Connect the battery and turn on the key. Reconnect the negative battery cable, and then turn the key on and wait 10 seconds before restarting your truck. You want to wait at least 10 seconds with the key in the “on” position before starting the engine, so that the system can “learn” the powertrain’s stop value. Figure 5.
  
  How to know if your alternator is working properly?
  
  1 Check the drive belt or serpentine belt. Look for signs of wear or damage like cuts, shiny spots or missing chunks under the belt. 2 Also, check the belt tensioner for proper operation and damage. It should rotate freely. 3 Make sure the alternator is properly mounted. 4 Check the alternator for noises.
  
  Alternators use diodes to rectify alternating current produced by the alternator into direct current. When one or more diodes go bad, the alternator can cause all kinds of problems. AC voltage leak can cause your lights to dim and drain power from your battery, for example.
  
  Why did the battery on my Ford Escape die?
  
  Worked great next day 2 Nd day after battery light back on And over charging again turned it off and restarted next day to put in bay and everything read Good readings worked good again for 2 days but yesterday showed battery light and today it is dead again. The garage checked the main connection from alternator to battery and said it looks good?
  
  Why does my car have a battery light?
  
  While the battery light might seem like there is a battery problem, but in fact there could be other numerous issue causing the battery light to activate. To see what is really wrong with the car see this video for things you can check.
  
  What causes an alternator to overcharge on a hot battery?
  
  One such design uses a “temperature compensated” computer sensor. The sensor dictates the amount of voltage an alternator puts out depending upon the temperature. Hot batteries demand less voltage, whereas cold batteries require more voltage. A defective sensor can send the wrong signal and cause an overcharge condition.
  
  What causes a car battery to overcharg?
  
  Improperly jump-starting the vehicle can send a surge through the battery that destroys one or more cells in the battery or shorts it out. This surge disrupts the wiring in the alternator, causing an overcharging condition. Additionally, an incorrect replacement battery in the vehicle can cause an overcharging condition.
  
  Why does my car battery light not go off?
  
  I checked the battery and it’s reading 12.8v with the engine off, and 13.8 with the engine on. Another time I tested it it showed 14v while running and the battery light was not on. I also did a diode test as per Paulster’s comment, and it showed 1 in one direction and -1199 in the other direction, which seems within spec.
  
  Is there a battery malfunction on my 2014 E350?
  
  Hi All, Just started getting the “Auxiliary Battery Malfunction” on my 2014 E350. Interestingly enough, Distronic Plus Inoperable message and Highbeam Assist Inoperable messages started too, along with parktronic not working – maybe related?
  
  Can a battery be charged if the alternator is not working?
  
  The alternator is definitely charging the battery and does not drain overnight but the battery light continues to stay on. Before spending money to test the fusible links, please advise If the alternator will still charge the battery with a faulty or blown out fusible link? Thanks. helpful? It will charge if one link is still working.
  
  Why does my Mercedes have a battery problem?
  
  Chances are the whatever algorithm Mercedes has programed into the cars diagnostics is something ridiculous and will never be understood. I was hoping someone else might of had the issue and and could confirm a battery replacement solved the issue (before I drop $135 on a batt) without any special resets or messing around.
  
  Why does the battery light stay on all the time?
  
  No lights were on the dash, drove it for about thirty minutes and suddenly all dash lights started to flicker on and off like crazy, barely made it home. I tried to start it ten minutes later but the battery was almost dead, just heard clicks.
  
  What causes the battery light to come on but not charge the battery?
  
  I was told a blown fusible link will trigger the battery light to come on and will not charge the battery. Based on what you are saying, if one of the fusible links is faulty it will cause the battery light to come on but will continue to charge the battery.
  
  Why does the battery light stay on on my Mustang?
  
  I have a Mustang that the battery light stays on. I changed the battery and the alternator was checked by Autozone, they said it was good. First off, you may want a 2nd opinon on the alternator. If both battery and alternator are good, then its either a wiring or ECU problem.
  
  How can I tell if my Battery Light is working?
  
  Check the contacts on the battery terminals/connectors to make sure they’re not loose, dirty, or corroded. Then follow the ground wire (the black one) back to the chassis of the car to make sure it has a solid ground.. The battery light works by connecting the battery’s plus side (through the ignition switch!) to the alternator’s positive output.
  
  What to do if your amp battery stops working?
  
  If your Amp battery is low, you can plug it in to keep using it while you’re giving rides. If your Amp’s power cable stops working, you can replace it with a standard micro USB cable. We aren’t able to provide replacement power cables. If you have an older Amp, extreme temperatures may affect its battery life.
  
  How long does an old amp battery last?
  
  Newer Amps need to be plugged in while they’re turned on. If you have an older Amp, the battery can last up to 8 hours. You can charge the battery with the micro USB cable that came with your Amp.
  
  Can a generator be replaced with an alternator?
  
  It appears your system has an alternator which means it is a PCM controller voltage regulator. Generators are the ones with internal voltage regulators and are replaced with the generator. Take a look at the attachments but Navigators with this issue usually have a failed regulator in the PCM. Let me know if you have questions.
  
  What causes a battery light to go out in a Ford truck?
  
  FOUND IT! I had checked Fuse #6 under the hood which was suppose to be for the alternator and it was fine, but I never checked #7 (secondary alternator) because my truck isnt equipped with the secondary alternator. However I pulled #7 today (5 amp) and it was blown. Replaced it and the light went out.
  
  May 25, 2016. The battery light or charging warning light, available on the dashboard of your car, indicates malfunctioning or poor charging of the battery. This light illuminates whenever the charging system does not charge the battery with a voltage above approximately 13.5 volts.
  
  What to do if your car battery light comes on again?
  
  Tip: Try starting your car in a safe location, if the battery light comes on again, do not drive it. Shut off the engine and open the hood to see whether the serpentine belt, alternator or battery have any problems that can be identified visually.
  
  Last week while driving, for about 3 seconds the battery light flickered on and then off. The voltmeter jumped up and down between high and low. Two days ago, the battery light appeared again and this time it stayed on. The meter kept low and then started dropping lower and lower.
  
  You could trying running a ground wire from one of the VR mounting bolts to the engine block. As Greer pointed out, voltage regulator must have good ground. You might also check to see if there is power to the field connection for the alternator, it (alternator field) needs to be energized for the alternator to charge.
  
  Can a bad alternator cause a car to die?
  
  If the alternator is bad, your car or truck will eventually die out again as the battery is not re-charged. Get a good-quality voltmeter or multimeter and test your battery’s state of charge. The voltmeter should read around 12.6 volts with the engine off and 14-15 volts when the engine is running.
  
  Can a bad battery cause an alternator to over charge?
  
  Make sure that all the connections to the alternator, remote voltage regulator (if applicable) and battery are clean, tight and in good condition. Check your battery or have it tested at your local auto parts store. A bad battery cell can cause the alternator to over-charge the good battery cells.
  
  To differentiate an alternator problem from the battery, you will need to use a voltmeter to check for voltage. First, turn off the engine and check the battery voltage. A fully charged battery should have a reading of 12.65 volts. Next, turn on the engine and recheck the voltage. You should have a reading of 13.5 to 14.5 volts.
  
  Long story short, I replaced both the alternator and the battery. I also replaced my MAP and Crank Shaft Sensors. I changed the oil and replaced my main belt as well. The car currently can only be jump started. The alternator is not providing power to the battery according to my volt meter.
  
  A $5 fix! Probably will need battery charged or replaced because car has been running directly from it. Sorry U had to unnecessarily replace an alternator. Most people will have U do that as guesswork. Good luck
  
  What should the voltage of an alternator be?
  
  Connect the other lead to a good ground (the negative post on the battery is a great choice!). Your alternator should be putting out between 13.5 to 15 volts. Anything less than this, and you have a bad alternator! If your alternator is putting out this voltage, then something else is killing your battery.
  
  If you clear the codes and the warning comes back lets make sure the fusible links have power on both sides. Here is a guide and the alternator wiring diagrams to help you test and see how the system works. Check the two fusible links in picture they should have battery voltage both sides. The problem may be the PCM but lets run some tests first.
  
  What should the resistance be for an alternator?
  
  If all this checks out then I suspect you have a wiring issue. I would perform either a voltage drop or resistance measurement of each of the wires from the PCM to the alternator. Also, through the fusible link from the battery to the alternator. You should have less then a half ohm of resistance.
  
  What happens if you have an alternator problem?
  
  Alternator problems can cause strong fluctuations of the power supply to these components. This will manifest in things like check engine light coming up for no reason, instruments on the dash going haywire, glitches in the electronics and so on.
  
  Your charging light bulb in the dash gets its power from the 10amp GAUGE fuse. The regulator in the alternator grounds that circuit as necessary to make the light come on. Was the battery light on dim before you installed the new alternator?
  
  What to do if your alternator dies while driving?
  
  You may notice your headlights or dash lights dim or the HVAC blower start running slower. If this happens, you should either turn every electrical accessory off that you can, and drive the car to the nearest repair shop, or park the car in a safe space and wait for a tow.
  
  When to get a secondhand alternator for a car?
  
  When you are low in cash and the alternator has no bad bearings i advice this, better than getting a secondhand alternator from a breakers yard, you never know how good that one is. What’s the top mistake when buying a car?
  
  What happens when the alternator is offline in a car?
  
  The pulley on the front of the alternator is still functioning normally, and the alternator is spinning, but not producing any power. With the alternator offline, the battery will be providing all electric power to the car for things such as the HVAC, radio, headlights, dash lights, and in some cars, the power steering.
  
  Why does my alternator cut off while driving?
  
  I just had the alternator replaced, but my car cuts off while driving. If your vehicle is losing battery voltage (i.e. your battery light is on) the problem may be your battery. You have a new alternator, so if your battery is bad, it won’t hold the charge from the alternator.
  
  How much does it cost to replace an alternator?
  
  Alternator Prices and Installation. Make sure that your current alternator is beyond repair first before getting a new one. Alternator prices can vary greatly by make and model, but generally speaking, new alternators should run around $250 without labor for installation.
  
  Why does the battery light stay on when the alternator is charging?
  
  If your vehicle’s battery light stays on, even when the alternator is charging, it could indicate that the battery circuits or the alternator system are malfunctioning. This will lead to improper charging. Having the battery light turn on when you’re charging can sometimes happen. But the light should go off after some time.
  
  If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system. If the alternator fails, replace it with a new or rebuilt unit and re-test system, if the alternator tests ok proceed to the next step.
  
  As a battery ages it loses its ability to hold a charge, as a rule of thumb a battery will last about three to four years. If the battery is fairly new you will need to start the engine by jump starting or charging the battery using a battery charger. Once the engine is running test the alternator in the charging system.
  
  What does it mean when your alternator stops the car?
  
  If you can’t get it to restart, this is a sign the alternator is doing its job of keeping the battery working while the motor is running, but the battery isn’t retaining the charge when the alternator has stopped. The car battery could be old. As batteries age, they become less able to retain a charge because the metal inside corrodes.
  
  What causes the intermitent blinking battery light to be intermittent?
  
  So the alternator is working but what could cause the battery light to be intermittent. When I say intermettent I mean that it comes on for 3 seconds, goes out for 5, comes on for 2 seconds, going our for 3.
  
  How can you tell if your alternator is a problem?
  
  How to tell if the alternator is the problem. If the battery is working, it’s time to take a closer look at the alternator. There are certain signs of a bad alternator to look for: While running the car, take note of the interior lights and how bright these appear.
  
  Can a car alternator fail if the battery is dead?
  
  Alternators can and will fail if they continue to run at full charge. If it is trying to charge a battery that is defective and won’t take a charge it will fail. You’re talking about trying to charge a defective battery, not a dead battery – there is a difference. Get your terminology streight before you accuse others of having their facts wrong.
  
  Can a bad alternator Fry a new battery?
  
  The flip side is that a defective alternator can fry a battery, also. So replacing a battery and having the new one go bad soon afterward might mean the alternator was bad to begin with. A depressingly large number of people don’t test the charging system after replacing a battery.
  
  What happens to an alternator if the battery is shot?
  
  If the battery is shot it’s a risk, but of the battery is good and the lights were left on, it should recharge without incident to the alternator. I suspect that while the initial load on the alternator of any drained battery is high, a good battery will charge and the load to the alternator will go rapidly enough that there should be no damage.
  
  Can a bad alternator cause a battery to go dead?
  
  Diodes should allow current to pass in only one direction, but a bad diode will keep the charging circuit open even when the engine in not running, allowing the battery to go dead. This often happens overnight. Even when the alternator is functional, if the wiring between it and the battery is damaged, it won’t keep the battery charged.
  
  Why does the battery light come on when the car is off?
  
  I have also tested it myself. Even pulled over on side of road to test it with voltmeter, when the battery light was on. Alternator was charging at 14.48 volts when car was idling. And resting battery when car was off was 12.71. Why is the light coming on?
  
  How often does an alternator need to be replaced?
  
  The typical lifespan of a new alternator should be between 5 and 8 years. If it has been that long and you have electrical issues, then your alternator may simply be worn out and needs to be replaced. If you think it could be your battery that is at fault, the typical lifespan of a battery is between 2 and 5 years.
  
  What causes an alternator to go over base voltage?
  
  If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring.
  
  Why is it important to have an alternator in your car?
  
  Your vehicle’s alternator has one extremely important job: Keeping your battery charged. Additionally, your alternator also pumps in a little extra electrical power, so that each electrical system runs optimally. Without your alternator, your battery would drain in a few minutes and your car would stop.
  
  Is there a problem with a rebuilt alternator?
  
  However, AA 1 Car states that there is sometimes a problem of quality with rebuilt alternators. One problem is that good quality in a rebuilt alternator means more money—the cheaper the rebuild, the more likely that the alternator will break again.
  
  Can a garage install an unknown alternator in a car?
  
  There are many garage owners who will suggest you an unknown brand’s alternator to be installed in your vehicle. Such suggestions are only made when you insist to cut down costs with the repairs.
  
  When does the battery warning light go off?
  
  The battery warning light in your vehicle turns on when you turn the ignition key to the “on” position. As soon as you start the engine, the light goes off and remains off until you stop the engine again — unless there’s a problem.
  
  Why does my battery light flicker when I Turn on the engine?
  
  Increase engine speed and the battery light starts to flicker. The voltage regulator in your vehicle ensures that voltage remains stable, usually about 13 to 14 volts. It’s fitted between the alternator and the rest of the electrical equipment, including the battery. If the voltage regulator fails, voltage can’t be controlled.
  
  The battery warning light in your vehicle turns on when you turn the ignition key to the “on” position. As soon as you start the engine, the light goes off and remains off until you stop the engine again — unless there’s a problem.
  
  Increase engine speed and the battery light starts to flicker. The voltage regulator in your vehicle ensures that voltage remains stable, usually about 13 to 14 volts. It’s fitted between the alternator and the rest of the electrical equipment, including the battery. If the voltage regulator fails, voltage can’t be controlled.
  
  What happens when the throttle control warning light comes on?
  
  There can be many different causes for the throttle control warning light, so a proper diagnosis is key. When the warning light comes on, there’s a possibility you either won’t be able to accelerate or you won’t be able to stop accelerating. Either of these situations could be extremely hazardous to you and your passengers.
  
  There can be many different causes for the throttle control warning light, so a proper diagnosis is key. When the warning light comes on, there’s a possibility you either won’t be able to accelerate or you won’t be able to stop accelerating. Either of these situations could be extremely hazardous to you and your passengers.
  
  Is the battery light on when the engine is off?
  
  Battery light on whilst engine running, and the battery voltage does not increase from engine off to engine on which I believe it should show an increase of about 2 volts.
  
  What should I do if my Battery Light is not coming on?
  
  Try putting a new light bulb in the gauge cluster. Like i said i know it sounds retarded but on some charging systems it requires a good bulb to complete the circuit and allow everything to work like it should. I’m not sure that our cars are that way but I have ran into that problem before on other cars and it blew my mind. Click to expand…
  
  Click to expand… Many charging systems put the alternator energizer wire through the light bulb. When the alternator starts charging positive voltage is equal on both sides of the bulb filament and the light goes out.
  
  Why does my alternator light get brighter when I Rev the engine?
  
  This voltage drop causes the light to light, and also results in the battery charging poorly if at all. Usually when this is the case, the light will be very dim at hiatal and will get brighter as you rev the engine.

Why does the battery light come on after the alternator is replaced?