Battery drains when not running

Asked by GuruS4DT2 May 07, 2019 at 06:41 PM about the 2004 Ford Taurus

Question type: Maintenance & Repair

Battery drains when not running unless I
disconnect it, then it's fine.

2 Answers


You have an electrical draw on your charging system somewhere. Sounds like your ALTERNATOR isn't keeping your system charged buy a multimeter and check your voltage with car running and accessories on should be between 12-14 volts if not your ALTERNATOR is most likely the issue. Good luck


Probably a "leaky diode" in the alternator is draining the battery. Test that first by disconnecting the alternator to see if the problem stops.

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