1999 Mercury Grand Marquis battery won't stay charged. Got new battery did the same thing.

Asked by Sep 22, 2016 at 12:32 PM about the 1999 Mercury Grand Marquis

Question type: Maintenance & Repair

Why won't my battery stay charged?

1 Answer

1,465

You could have a bad alternator, that's not charging the battery. Voltage running should be 14.5 volts at the battery. You could also have a current drain, draining the battery overnight. Disconnect the battery at night to see if this is the case, assuming it's being charged by the alternator.

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