Why is my brand new battery is going dead to a 1999 grand maquis

Asked by choppaboi Jun 18, 2015 at 05:27 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

2 Answers
189,455

Paul answered 9 years ago

Your altnator my not be charging thus draining your battery. Your belt could also be loose....have the altnator load tested..

Mark helpful
159,085

Bob answered 9 years ago

Clean battery cable connections are a must.You could have a parasitic draw on the system. With engine running you should have 14 to 14.6 volts measured at the battery terminals. If it is below say 13 volts (engine running) I would suspect the alternator is bad or the fusible link in the battery to alternator cable has an issue. If the voltage checks out look for a trunk light, glove box light or an under hood lamp staying on that could be running the battery down.

Best Answer Mark helpful

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