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defroster switch don't work

Z

zgator

Guest
I was reading a post where a guy was looking for one and I decided to post my problem. There has been a few times 3or5 times that the little orange light came on for a second but then went right back off. I have an 82CE and was wondering if it has anything to do with the hatch.It looks like all the wires are in place and my hatch works great. I hope it isn't a bunch of wireing stuff. Thats far from my strong point. I hate wires and have no learning about it..I can't even hook up my home theather right.:rotfl
 

duke94

Well-known member
Joined
Jan 30, 2007
Messages
277
Location
Ann Arbor, MI
Corvette
71' convert and 78' both Red
Sounds like it might be the "Timer relay". It is suppose to shut off the defogger after about 10 minutes, but yours kicks off right away. Could also be a poor ground. The ground is located on the left windshield pillarHere's the circuit.

78reardefog.jpg
 

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
Mine turned out to be the ground as mentioned above.
 
Z

zgator

Guest
Mine turned out to be the ground as mentioned above.
I hope it's a ground because that sure is a pretty picture (and I know what it is) It don't make since.I will however print it because I do have a friend that knows these like the back of his hand so thanks a lot.I know the fix is in there somewhere;shrug
 

Vette79

Well-known member
Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
I hope it's a ground because that sure is a pretty picture (and I know what it is) It don't make since.I will however print it because I do have a friend that knows these like the back of his hand so thanks a lot.I know the fix is in there somewhere;shrug
Trying to read the electrical diagram can be confusing. However, the rear defroster is pretty simple. You have a ground connection to check on the passenger side just behind the T-Top anti-theft switch. I purchased a 12v light tester to check the rear defroster switch to see if I have power to the switch. Do this when the key is turned to the on position and be careful to touch only one terminal on the switch at a time. If no power check to see if the fuse in the circuit is open. If you have power to the switch it could be a bad switch or a loose connection from switch to ground. When I had to do this, I started with the switch and worked my way back to ground following the wiring which runs underneath the bezel around the drivers side of the emergency brake and then underneath the carpet behind the drivers side seat then up and behind the drivers side anti-theft switch for the T-Tops and then across to the passenger side where ground is. Behind the drivers seat under the carpet there is a connection that simply may need to be disconnected and then reconnected. You might want to start with the ground as this is probably the most easiest and problematic for the rear defroster. There is a little more involved and I am sure someone else could chime in to give some other suggestions or specifics but just wanted to assist since I have tackled this problem already. Hope this helps. ;)
 
Z

zgator

Guest
Yeah. I'll for sure keep this as I plan to change my carpet sometime soon. I've got the carpet but don't really need it yet but I knew that buy the time I did need it the price would have gone up.Thanks.I at least know how to check for a bad ground.:beer
 

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