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Old 02-06-2009, 09:33 AM
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1997 and 1998 F-150 models are notorious for GEM problems that stemmed from a leaking windshield that gets water into the GEM and sets up corrosion in it. Usually strange electrical problems crop up to plaque the vehicle. The GEM controls a lot of things by completing the ground path for relays and other low current circuits. It is possible that your trouble is GEM related. The GEM is located under the dash on the driver side of the truck. It is on the back of the fuse panel. Take it out and look for signs of water damage and corrosion. Good luck!
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