Mechanics

POWER WINDOW FUSE OR RELAY

Mercury Mountaineer

All power windows on my 2002 mercury mountaineer stopped working at once. I have no power at the connectors that plug into the swithes. The owners manual doesnt say which fuse controls them. The ground is good at the switch. I tested all the bigger fuses with my tester (20 amps and up)which were all good and I dont have any shorts. Is there a relay or something I'm missing? It has 60 k on it and its got a 4.0L v6
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Julius
April 9, 2007.



Hey julius,
That year merc had two wiring schemes for the PWs, an early and late design. Both have a 60 amp fuse (#6) in the pwer junction block under the hood.

Then there is either a 30 amp fuse (#47) in the same box or a circuit breaker on the way to the central junction box.

Both have a 15 amp (#17) fuse in the central junction box. They also share an accessory delay relay.

The relay is controlled by a Gem (generic electronic module) module. I remeber seeing something about these going bad because of a leak in the windshield cowl on explorers.

All power goes to the master switch first and then to the individual switches on the doors.

If you are getting no power at the master switch, check the fuses/circuit breaker first, swap out the relay next, and then check the Gem module.

If that doesn't work following wires looking for a short is the next step. PITA!

Good hunting and let us know. : )
peppermrj

Tiny
Peppermrj
Apr 10, 2007.