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A short in the wiring.

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Q: What would cause the battery to drain when the lights are on in a 2002 KIA when the alternator is good and battery is good?
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What would cause the battery to drain on a 1999 Ford Expedition 1999?

Bad Battery. Bad Alternator. Lights left on by mistake. Something left running. Exc.


Can a loose positive battery cable prevent the alternator from charging the batter and can it cause a battery drain while the engine is not running?

Yes, a loose battery cable will prevent the alternator from charging the battery. The drain on the battery is not caused by the engine not running unless an accessory is left on. Most likely, the drain is caused by accessories (radio, lights, etc) while the engine is running due to the battery not receiving its charge from the alternator and then not having enough charge left to start the engine.


Battery drainage on 1997 Chrysler town and country and is not alternator could it be that the radiator needs flushing which it does but would it cause battery to drain?

A raidator in need of a flush will not cause a battery drain.


94 Lebaron needs a boost every morning the battery has been replaced the clamps are clean and tight it does not appear to have any lights left on What is the cause of the battery draining?

Have you had the alternator tested? Often a bad internal diode can drain the alternator overnight.


Could alternator drain battery when car is not running?

If the alternator is installed incorrectly, yes, it can drain the battery.


What would cause a battery drain on a 1991 F-150?

Shorted diodes in the alternator.


Will a dead alternator drain a battery?

Yes. If the alternator is dead and you drive the vehicle, all the power is coming from the battery and it will eventually drain completely. Also, if a diode is shorted inside the alternator, that can drain a battery.


What would cause a large drain of a battery of 1998 ford escort?

Your alternator could be bad.


What would cause a battery to drain in a 1989 mercury sable if it is not the power cords or alternator?

dead cell in the battery or something is on pulling power from the battery.


Can a bad alternator drain a good battery?

It doesn't actually drain the battery, but without a working alternator to recharge the battery it will only discharge as the car is operated.


Why does my battery die when i use my lights?

Bad alternator and/or belt. Your battery isn't being re-charged while you run the engine, so the electrical things drain the reserve from the battery.


Could something other that alternator cause battery to drain on 2005 C180 Kompressor?

Yes, a dead cell in the battery or something is on drawing power from the battery.