what is the usual cause for a parasitic battery drain on a 1993 grand marquis

Asked by Jan 01, 2018 at 01:38 PM about the 1993 Mercury Grand Marquis

Question type: Maintenance & Repair

2 Answers

30,885

There isn't a "usual cause", any electronic component can cause one, any short to ground can be a parasitic drain. Look up a few how-to's on finding parasitic drains. Just FYI, constantly opening a door will keep one or more computer modules in an active state and drawing more current, so if doing a test with a meter you may want to take that into account, or pull a fuse for the door so when you keep it open to access an interior fuse box it's not causing anything to remain active while doing your test.

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1,505

Don't forget to test the alternator, sometimes the diodes go bad. Look for things like trunk light not going off. Radio.

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