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5/9/11 2:26pm - Original Message: 'Rear Defogger not Working'
cavellier
Former Member
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Oxford, MI - USA

Vette(s):
1979 Corvette L-82 4 pd

Joined: 5/8/2011
Posts: 14
I have '79 vette with a rear defogger not working. The green light on the switch switch does not come on. I looked under the dash at the fuse panel but am unable to locate the fuse for this. The manual says it is a 35 amp fuse but I can't find it.

Any ideas?
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5/9/11 7:04pm - Reply: 'Rear Defogger not Working'
dskopp
Former Member
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
My 81 Shop Manual says that I would have a "10 amp fuse and a circuit breaker located in the fuse block"  Based on what you are saying, it could also be:  Circuit breaker open from an electrical short in the power feed circuit, Burned fusible link, Burned out or missing monitor lamp, Open circuit in either of the wiring harnesses, Inoperative or disconnected control timer assembly, Defective control switch, Defective control switch, Defective control timer switch, Defective control timer switch.  Any further questions???  I am going to go out on a limb and say that you have a defective control timer.  It should be located in the center consoul or in the compartments behind the seats!!  Let me know what you discover!!Big smile   There is a 30 amp circuit breaker and a 10 amp fuse in the fuse panel (should be near the drivers left food behind the left kick panel! 
Dan
dskopp2011-05-09 16:18:38

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5/9/11 8:00pm - Reply: 'Rear Defogger not Working'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Jim, when my rear window defroster went out, I replaced the switch AND the relay and it still didn't work. Turned out the problem was where the harness in the engine compartment goes into the bak of the fuse box. It had pulled away and corroded. Fixed that and it was good as new (not typical results, your results may vary. Any problems contact your doctor. Oh wait, thats different!)
 
Barry
 
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5/9/11 9:33pm - Reply: 'Rear Defogger not Working'
cavellier
Former Member
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Oxford, MI - USA

Vette(s):
1979 Corvette L-82 4 pd

Joined: 5/8/2011
Posts: 14
I'll take an electrical tester through the components that are outlined above this weekend and see if I have any luck.
 
Thanks for the suggestions.
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