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Registered
Join Date: Oct 2000
Location: Layton, Ut, USA
Posts: 52
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Rear Window Defogger
I've spent several hours -decoding- the electrical digrams for the rear window defogger, and I have the problem isolated, to a short to ground somewhere between the relay output terminal and the input of the defogger. (US Driver side of rear deck window)
The problem is, getting under the relay panel on my 85.5 944. When I try to lift the relay panel from under the hood, to get a look under the relay, to won't come up far enough. I'm afraid to pull too hard, least I cause new problems. I crawled under the driver side dash, and was able to undo 2 of the 3 nuts covering the bottom of that relay panel but again no cigar. Anyone have any idear where that wire bundle runs from the front to the back of the car? Or anyone fixed this before, or is the problem unique to me? Help! Richard (Dick) Foy |
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11-12-2000, 01:24 PM
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Registered
Join Date: Oct 2000
Location: Layton, Ut, USA
Posts: 52
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No, I've disconnected the wires on both sides where they first connect to the 'shocks' on the rear window defroster. The short can be read on the wire coming out of rear window rubber groment, as well as at the relay output post, with the relay pulled out, so I know the short to ground is somewhere in between. (btw it blows the 30A F13 fuse....12v thur fuse to ground...fuses don't make very durable resistors.
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11-12-2000, 01:45 PM
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Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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Don't know if this will help but the rear defogger is a little tricky. One of the snubbers, the one on the driver's side, should have a plastic (non conducting) socket where it slips over the ball on the car body. The shock is actually the conductor and puts the juice in the heating element. The other shock is the ground shock. It has a metal base. Make sure you do not have two snubbers with metal ends. One has to be insulated else you have a dead short.
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11-13-2000, 12:31 PM
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Registered
Join Date: Oct 2000
Location: Layton, Ut, USA
Posts: 52
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nope, its not that...I still have a short ground even with that connector pulled loose..I'm pretty sure its in one of the mirror heaters..just have to figure out how to pull off the mirror
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11-15-2000, 02:37 PM
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Join Date: Jun 2000
Posts: 199
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might be easier to just disconnect the mirror heater, the later mirrors have a ring bayonet mount that you turn using a small screwdriver from the hole in the bottom. if you could look inside youll see slots on a plastic piece that you put the screwdriver tip into and slide the ring around the mount.after you break it to get it apart youll see what i mean.
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11-15-2000, 04:31 PM
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