Trippmeister answered 7 years ago
You could have a bad alternator, that's not charging the battery. Voltage running should be 14.5 volts at the battery. You could also have a current drain, draining the battery overnight. Disconnect the battery at night to see if this is the case, assuming it's being charged by the alternator.
Why won't my battery stay charged?
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Maintenance & Repair
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