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A bad alternator will run down the battery.

Maybe. Lets check the simple stuff first.How do you know that it IS charging in the first place?

Get a voltmeter (VOM) and measure the voltage of the battery when the car is off. It should be more than 11.5 Volts. (Or it is really discharged battery).

The start the car and measure the voltage again. It sould be at least 13.5 Volts up to about 14.5 volts.

If not then the alternator is not giving enough voltage to charge.

If it is, then it could still be a diode in the alternator that is bad.

You cold have some accessory or light that stays ON somwhere draining the battery.

It could be a bad battery.

It could be a bad set of battery cables.

2015-07-16 18:05:10
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