My 1999 mercury grand Marquis us killing my battery. So is it the battery or the alternate?

Asked by PaulieApril Jul 27, 2014 at 01:19 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

2 Answers
199,785

dandyoun answered 9 years ago

Test alternator output voltage. It should be 14.5 volts or so. If not it's probably bad. Does it drain down while driving or when it sits overnight? If while driving check alternator and battery connections. If overnight test for parasitic draw.

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199,785

dandyoun answered 9 years ago

www.youtube.com/watch?v=zdIKNnwEjIs -- this is how to do the draw test.

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