Question about 1999 Mercury Grand Marquis

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Battery on my 1999 Grand Marquis went dead a few months ago. There was no indication of battery losing its charge. The battery light never came on. I replaced the battery and things worked fine for a few months and then this battery discharged, again no idiot lights indicating any problem. What may be connected to problem is that a couple of times the digital speedometer started showing 0 when in fact the car was going at 40 mph. One other thing, there is a squeaking which has started; cannot tell where it is coming from, but at times it gets very loud and sometimes turns into a chatter. Could all of these symptoms be the alternator? or what? Thanks, Jim

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Well the way I approach these situations, regardless of the make, is to get an ammeter in line with the positive cable and the positive battery terminal. With the ignition off there should be a very low current drain to keep the clocks, theft stuff, and door lock remotes (if equipped) enabled. So with the ammeter in place pull one main fuse after the other and see which fuse's removal causes the current to fall to a very low level. Now see what doodads are on that fuse and disconnect them one at a time until you have disconnected the feature which causes the current drain to fall down to nearly nothing. That is your bad guy. Usual suspects are trunk and glove box lights, power door locks, air ride suspension pumps, and the electrics which turn them on and off. Good Luck

Posted on Aug 04, 2010

Testimonial: "Thanks wekjo. That would be a good starting point."

  • jrschnei Aug 04, 2010

    I should add that the 2nd time the battery went dead was when I was driving the car. First the dashboard lights went out completely and then I started to lose power. A beeping started also. I was just able to limp the car back home. The car would not restart after I parked it, although it started the next day when the battery recharged a little overnight.
    Also, the first time it did not start was in the morning, but I checked and the interior lights were off and the headlights were not on either.



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