2003 Grand Marquis fuse box diagram
Go to the under the dash fuse block and check fuse #15. Then go to the under the hood fuse block and check fuse #103, a 40 amp fuse. Also in this fuse block check/replace relay #301. Do one at a time until you find it. I think it will be fuse #103. It could also be the motor or a loose plug to the motor. Tell us what you find.
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