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Rear Defogger

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
Need some help in determining why my Rear Defogger does not work on a 1979 Corvette. All other accessories in the Vette work. It obviously is not the fuse, where should I look? I understand that there is a relay and a ground but don't know where they are located. Can anyone provide some input as to where to look and what to start with? Thanks...Jeff.
 

duke94

Well-known member
Joined
Jan 30, 2007
Messages
277
Location
Ann Arbor, MI
Corvette
71' convert and 78' both Red
Below is the schmatic and wiring harness from my 78' and the trouble shooting info from 79' Hope it helps you..


78reardefog.jpg


78rearwindowdefogwires.jpg


Reardefogtroubleshoot.jpg
 

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
Duke, thanks again for the diagrams. Very helpful. Looking forward to troubleshooting this. Looks like a fun one...LOL.
 

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
Is the defective control timer assembly the relay? Can we still get these parts? I have seen the switch but what about the above mentioned part?
 

duke94

Well-known member
Joined
Jan 30, 2007
Messages
277
Location
Ann Arbor, MI
Corvette
71' convert and 78' both Red
Is the defective control timer assembly the relay? Can we still get these parts? I have seen the switch but what about the above mentioned part?

I believe so. I have not seen this part in any of the catalogs. Might be a eBay thing or one of the Corvette salvage yards.
 

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