Question about 1999 Mercury Grand Marquis
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."
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Posted on Jan 02, 2017
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