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If you put a volt meter across the battery terminals with the car running it should be approx 13+V....if it is less,and possibly fluctuates when you rev the car the alt. is probably bad. As well if the voltage is too high (17-19V)then the regulator is probably gone ( I think it may be internal to the alternator on those)

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18y ago
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Q: How can you tell if your alternator on a 1997 Chevy lumina is bad without taking it to a shop?
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