Why does my alternator run when I Turn Off the car?

Generally, an OEM harness will not have the problem of alternator “run-on”, as there is usually a resistance wire in the dash harness to keep this from happening. Solution: To figure out where the problem exists, start the car and with the key in the ON position and the car running, turn off the key.

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.

What happens when the belt on an alternator breaks?

A closer observation of the alternator will reveal a pulley and belt system that works to convert mechanical energy into electrical energy. The serpentine belt powers the alternator, and if it fails, the alternator will stop working the moment your belt wears out and breaks, or the pulley becomes damaged.

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 happens when an alternator goes bad in a car?

The alternator plays a vital role in supplying power to the car’s AC, recharging the battery and ignition. When your alternator is faulty, the battery power is drained fast, and you will find yourself with a stalled car. But what can cause the alternator to go bad?

What happens when the serpentine belt fails on an alternator?

The serpentine belt powers the alternator, and if it fails, the alternator will stop working the moment your belt wears out and breaks, or the pulley becomes damaged. This can also happen if the serpentine belt is not tightened correctly. Most cars have automatic tensioners, but these can fail, so it is better to double-check.

Why is there a noise coming from my alternator?

Noise from the alternator could be caused by a faulty rotor shaft, rectifiers, bearings, slip rings, stator winding or brushes. You will need to carefully inspect each of these components and replace them. One sure way of confirming that the noise is coming specifically from the alternator is to use a vacuum hose.

What should battery voltage be when alternator is not charging?

The alternator is connected to a set of belts which when loose can cause it not to function as required. 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.

What to do if your 2016 Honda CRV won’t start?

This problem may be covered under warranty. Ask your Honda dealer. Get free help with your lemon! No one has added a helpful site for this 2016 CR-V problem yet. Be the first! Read reviews of repair shops in your area. Enter your zip code: I am posting this because this is now the 5th time this year that my 2016 car is having this problem.

What’s the name of the car that won’t start?

We purchased a used 2012 in Oct 2016 BC and my husband drove it to Ontario. Got in the car which was just serviced YESTERDAY and the car wouldn’t start. Periodically, the car would take a few seconds longer to start or start on a the 2nd/3rd attempts.

What should I do if I cant start my car?

First, if you cant start your vehicle with your car key, you can use a lock dry lube. This provides lubrication so your keys can slide in and out without getting stuck. The first step to start a car is to… Check Your Engine oil: This should be your first step. When a vehicle isn’t used, insects and animals like to make your car their new homes.

What do you need to know about AAA car guide?

In this chapter, the AAA Car Guide lists the kinds of things you need to consider to determine what type of vehicle is best for you; then it describes various available options according to body type, size, and powertrain. Read more about different vehicle types in Chapter 1 of the 2021 AAA Car Guide.

What to do if your car wont turn over but has power?

To determine why your car won’t turn over but has power, you need to disconnect the cable from your engine and let the engine run for 30 minutes to see if the alternator can charge the battery and power the car.

Why does my car not start when I turn it on?

The technician you went to could be on to something there with the shaking and possibly having moisture in the fuel tank. However, it sounds like you could be having an intermittent electrical component fault which can be difficult to trace when everything is working properly. If the vehicle does not turn over, then the starter is not engaging.

What to do when your car shuts off?

If your car does shut off when you remove your alternator plug, you may have to put a diode in line on the field exciter wire to keep the alternator from back feeding to the ignition switch. Again check with the harness manufacturer for help.

Why does my car run when the ignition is turned off?

With the ignition turned off and the car continuing to run, simply remove the plug from the alternator (DO NOT TRY AND REMOVE THE BATTERY POWER WIRE FROM THE POWER STUD!) and the car should shut off if the alternator is creating the problem. If it does not stop running, your feedback problem is coming from something other that the alternator.

What to do when your car does not stop running?

If it does not stop running, your feedback problem is coming from something other that the alternator. If you are using an aftermarket ignition unit, check to see if there is a fix available that includes a diode to put in line on the ignition feed to keep their system from back feeding into the ignition switch.

How does auto start stop work in a car?

Auto start-stop is engaged when your vehicle has come to a stop and the brake is pressed. When these two things occur, the engine stops entirely and disengages the transmission, effectively shifting it to neutral.

When to turn off the engine in a car?

According to a study conducted by the Society of American Engineers, it is beneficial to turn your car’s engine off if it is going to be idling for at least seven seconds. Within that range of time, enough fuel is saved to start the car once more, meaning that any time spent with the engine off over that seven-second mark will be fuel saved.

How does an auto start-stop system save gas?

There are no additional parts besides some circuitry that is necessary for an auto stop-start vehicle. Does Auto Start-Stop Save Gas? While it is hard to measure the specific effect that auto stop-start systems have on MPG, it is clear that they do save fuel. Your car burns significantly more fuel idling than it needs to start the engine.

How does auto stop start affect your mpg?

While it is hard to measure the specific effect that auto stop-start systems have on MPG, it is clear that they do save fuel. Your car burns significantly more fuel idling than it needs to start the engine.

Why is my Chevy S10 2.2 stalling?

Few days ago my wile driving my 1995 S10 2.2 I felt a little hesitation like it was time to change the spark plugs. just stop and id not want it to start at all. I check the fuel filter and visually check the gas pump flow and there is plenty of gas moving trough that area. Also check the sparks and they are all good. What else can it be? Ah!

Why is my Chevy S10 GMC S15 dying?

My mechanic said that he charged the battery and put in a new alternator and got it to run just to move it into his garage then it dies again. It is so dead, that none of the lights work, nothing. He thinks it might be an electrical short, but cannot trace it without an electrical diagram/schematic of the starting system.

What’s the problem with my 1997 Chevy S10?

Any ideas on what is wrong? My Chevy 1997 S10, 38,000 miles just died. My mechanic said that he charged the battery and put in a new alternator and got it to run just to move it into his garage then it dies again. It is so dead, that none of the lights work, nothing.