If I leave alternator plug in after turning the truck off the battery drains, I have changed the alternator and still drains battery

Asked by Jun 12, 2017 at 11:55 AM about the 1987 Ford F-150 XLT Standard Cab SB

Question type: Maintenance & Repair

1 Answer

24,510

You have a parasitic draw on the battery when the engine is off. It is easy enough to trace, just way to long to explain here. Google parasitic draw on auto battery and you will find many videos.

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