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If the voltage while the vehicle is running, is somewhere around 13.8 volts, that means

the alternator is working properly. The best thing to do, is to disconnect the battery

cables and load test the battery with a load tester, not a volt meter. Just cause the

battery is saying 12 volts,doesn't mean it's good. Once it is under a load, say with your

headlights on, it may just start to drop rapidly, and not hold a charge. I'd just replace

the battery, if it's not holding a charge, and the alternator is working properly showing

a combined voltage of around 13.8 volts while connected to the cables and running.

Good luck.

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Q: Battery is not charging on a Chevy s10 but is not the alternator what can it be?
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