BATTERY LIGHT

Asked by John Sep 27, 2019 at 07:11 PM about the 2009 Mercury Grand Marquis LS

Question type: Maintenance & Repair

I have a 2009 Mercury Grand Marquis..battery light stays on..charges just
fine...I put several new alternators on it and the  same thing.....I've been driving
it for 9 mos this way charges just fine,starts strong. the light just stays on.
Thanks

1 Answer
157,475

Bob answered 4 years ago

Put a DC volt meter on it to see what the charging voltage is. The PCM controls the alternator and it may be overcharging. If it is overcharging the battery will eventually be ruined.

Mark helpful

Your Answer:

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