Rear window defogger dead.
Thread Starter
Racer
Joined: Aug 2000
Posts: 364
Likes: 3
From: Van Wert Ohio
Rear window defogger dead.
The rear window defogger on my '79 quit working. Fuse is good. The next most likely suspect part is probably the timer/relay. Looks expensive and I've not found it in any of my catalogs. Anyone run into this?
Racer
Joined: Apr 2000
Posts: 499
Likes: 0
From: Kristiansand
Re: Rear window defogger dead. (vett79)
Yes, I had this problem.
It turned out to be a fault in the relay. There are some power transistors in there thet have poor support and they develop cracks in the soldering to the PCB. Resolder solved it.
The same goes for other relays containing electronics, viper and interior light.
It turned out to be a fault in the relay. There are some power transistors in there thet have poor support and they develop cracks in the soldering to the PCB. Resolder solved it.
The same goes for other relays containing electronics, viper and interior light.
Instructor
Joined: Dec 2000
Posts: 115
Likes: 0
From: Toronto
Re: Rear window defogger dead. (Ingar, Norway)
most of the releys are the same trough out the chevy line,all though the problem with nine out of ten rear defogs is a bad ground on the far side of the rear glass. take a test light and ground one lead,then touch the wires of the grid and see if you have power to it.should be strongest in the middle of the glass.no light means no ground.
Melting Slicks
Joined: Aug 2000
Posts: 2,962
Likes: 1
From: Topeka-Pothole capital of the universe
Re: Rear window defogger dead. (figment3)
I have the same problem, but have never checked it out. Have not looked
it up in the manuals, so, where is the relay located? I will also check
out the suggestion of a bad ground. Unfortunately, I have to wait a week
when I get the car back (with a new differential!!).
it up in the manuals, so, where is the relay located? I will also check
out the suggestion of a bad ground. Unfortunately, I have to wait a week
when I get the car back (with a new differential!!).
Racer
Joined: Apr 2000
Posts: 499
Likes: 0
From: Kristiansand
Re: Rear window defogger dead. (vett79)
Ok, then it was moved in 1980. My relay is located in the passenger side compartment.
Btw: I have a mod for extending the "On"-time at my page. (+ all 1980 schematics)
Btw: I have a mod for extending the "On"-time at my page. (+ all 1980 schematics)
Racer
Joined: Nov 2001
Posts: 355
Likes: 1
From: Pennsville NJ
Re: Rear window defogger dead. (vett79)
On my '77 I have the little Rear Defroster switch and it lights up when you click it, but my back window is just plain. Were they all made with a working switch or was the back window replaced???
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