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Worn out, low electrolyte, a draw (something left on) alt not charging. You need a cheap voltmeter to check (about 5.00 from auto parts store)

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Q: Why your battery could be drained in a car?
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Why is a car battery being drained in an 1985 Fiero. A rebuilt alternator has just been installed but the battery is still contueing to be drained?

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