Ford Mustang Forums : Mustang Forum - View Single Post - Battery Draining But Parasitic Draw and Alternator Test OK
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post #6 of Old 04-19-2019, 01:05 PM
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I had a problem like that once, when my Autometer Monster Tach was wired to a constant 12V+. Changing to a switched 12V+ solved that issue. So make sure you don't have something aftermarket drawing on the battery when the car isn't running.

1989 Mustang GT
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