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Is 12.8 voltage ok while car is on?

Updated: 10/19/2022
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12y ago

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No, that is far too low. With the engine running you should read 13.5 to 15.5 volts at the battery posts with a digital volt meter. You alternator is not functioning properly. With the engine off a 100% fully charged battery will read 12.6 volts.

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12y ago
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Q: Is 12.8 voltage ok while car is on?
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