Why does my battery light come on when I start the car?
Why does my battery light come on when I start the car?
It’s almost always going to be caused by a bad batteryor alternator. The battery light comes on when it detects that the voltage in the battery is too low. Most battery lights will come on when the vehicle starts if the computer has detected that the voltage was too low for a quality start.
Why does the battery light come on on my Ford Escape?
If your Ford Escape’s battery light is on, it means a few things. It is trying to warn you that there is an issue with the charging system. The charging system itself is relatively simple. It’s almost always going to be caused by a bad batteryor alternator. The battery light comes on when it detects that the voltage in the battery is too low.
How can I tell if my Battery Light is working?
Ask the person doing the test if he can tell you what the field voltage is on the alternator. If they can and it is around 12 volts or more you can probably bypass the next test. Start the vehicle and hold a steel tool near the back of the alternator (not on the pulley side). It should be drawn magnetically to the center of the alternator.
Why does the battery light stay on when I change the alternator?
If you changed the battery first, then changed the alternator, this may not have happened. Sometimes it’s as easy as fully disconnecting both terminals and reconnecting the battery. Check the voltage from the positive terminal of the battery to the negative terminal on the battery (record this).
Why does the battery light not come on?
If your alternator is putting out 10-10.5 volts or less means one of the diode pairs are bad, 5-5.25 volts or less 2 diode pairs are bad. Either way the alternator is not charging the battery and it’s the fault of the voltage regulator. Ask the person doing the test if he can tell you what the field voltage is on the alternator.
If you changed the battery first, then changed the alternator, this may not have happened. Sometimes it’s as easy as fully disconnecting both terminals and reconnecting the battery. Check the voltage from the positive terminal of the battery to the negative terminal on the battery (record this).
Can you test the battery light while the engine is running?
WARNING: The next test is the “old fashioned” way we shade-tree mechanics used to do this. It can be done with the engine running in most cases, but you must be extremely careful that you don’t get clothing or long hair anywhere near the pulleys. You do this at your own risk.
Why does my car battery keep coming on and off?
If not charging properly, a new battery may keep you going for a while, but sooner or later will eventually crap out on you. If the voltage is good going to the battery, you should be ok. Good clean and tight connections are also very important, positive and negative are equally important.