Rear Window Defogger
Thread Starter
Racer
Joined: Feb 2005
Posts: 327
Likes: 1
From: Higgins Lake Michigan
Rear Window Defogger
Anyone know the wire colors and where the wires go to on the fuse panel for the rear window defogger on a 81 vette ? Sometimes the fogger will work properly other times it's a no go. Any help would be great , has me stumped. Thnx Dave 
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Originally Posted by whiteflame
Anyone know the wire colors and where the wires go to on the fuse panel for the rear window defogger on a 81 vette ? Sometimes the fogger will work properly other times it's a no go. Any help would be great , has me stumped. Thnx Dave
Last edited by ...Roger...; Sep 24, 2006 at 12:38 PM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Originally Posted by whiteflame
When it does come on, i have check the strip at the rear window with a test light. When it does not come on , no power a the rear window. Thnx i'll check it out.Dave
Former Vendor
Joined: Aug 2006
Posts: 76,656
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
White,
Check for corrosion in the braided wire the runs from the window to the main rear harness. They like to corrode right there and cut power to the window.
Willcox
Check for corrosion in the braided wire the runs from the window to the main rear harness. They like to corrode right there and cut power to the window.
Willcox
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
In the back widow you have a wire grid, at the top of the grid you have a power wire on the driver side and a ground wire located on the passenger side. You will have to remove the rear upper window trim mouldings to see the wires. But to locate them quickly, they are at the top of the glass right in front of the third wire from the side. So, start at the first grid wire in the window and count inward three wires.
The positive wire where it’s hooked up to the grid will corrode if you have had the rear window leaking. In cases where you have a car that has had water standing inside it from another water leak, it will also corrode this connection. (Don’t forget to check the plug connector where the positive wire plugs to the main harness, it’s a single black wire with a single spade connector on it.
Check the ground wire real good under the bolt where it bolts to the header of the car. It will also corrode either from a water leak, or humidity present in the cockpit of the car.
And lastly check the continuity of the wire grid to make sure you don’t have any breaks in it. There are repair kits available for them. But if one wire is broke in the grid, the defroster will not work.
Willcox Inc
The positive wire where it’s hooked up to the grid will corrode if you have had the rear window leaking. In cases where you have a car that has had water standing inside it from another water leak, it will also corrode this connection. (Don’t forget to check the plug connector where the positive wire plugs to the main harness, it’s a single black wire with a single spade connector on it.
Check the ground wire real good under the bolt where it bolts to the header of the car. It will also corrode either from a water leak, or humidity present in the cockpit of the car.
And lastly check the continuity of the wire grid to make sure you don’t have any breaks in it. There are repair kits available for them. But if one wire is broke in the grid, the defroster will not work.
Willcox Inc
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