Question about 1985 Ford Mustang

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What would drain the battery overnight,every morning car is dead. two mechanics can't find anything

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  • Zaraki Sep 30, 2010

    Dis-connect the battery and then use a volt meter to check and monitor the battery voltage, with the battery dis-connected the battery voltage should remain steady, but if the battery voltage slowly drops off then the battery has an internal short or a bad cell and the battery itself will be the problem.

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If the battery doesn't have a bad cell in it then double check any direct hot wires that lead from the battery directly and disconnect any that are not needed. Typically an alarm will do this if the alarm is malfunctioning. On rare occasions a vehicle radio secondary power line will cause this to happen.

Posted on Sep 30, 2010

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