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Topic: Rear defrost black wire

in Forum: C3 Electrical


Rear defrost black wire

Posted: 4/8/25 3:23pm Message 1 of 12
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Vette(s): Inherited a 1979 C3 350 Cubic inch.

Hey folks, I just inherited a 79'and noticed that there is black wire hanging from the top right (if facing from the back) rear glass and not sure if its for the rear defrosters. Where do I connect it to? Thanks, Mark



|UPDATED|4/8/2025 3:23:49 PM (AZT)|/UPDATED|



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Re: Rear defrost black wire

Posted: 4/8/25 2:54pm Message 2 of 12
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Eagleville, PA - USA
Joined: 11/1/2001
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Vette(s): Used to own a 1979 Corvette now owned by JB79

Are you able to post a picture? I suspect it's rear defroster, like you said. 

Also, does it really say Stingray on the side of your 79?




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Re: Rear defrost black wire

Posted: 4/8/25 3:25pm Message 3 of 12
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I have added a picture for you to review and no it does not.  I updated the post and took that word out. Thanks.




Re: Rear defrost black wire

Posted: 4/8/25 4:32pm Message 4 of 12
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malesandro said:

I have added a picture for you to review and no it does not.  I updated the post and took that word out. Thanks.


The picture is not showing up.  Make sure to click the "Upload Image" button above the message entry box, and follow the instructions to upload the photo then insert it into your message. Thanks!




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Re: Rear defrost black wire

Posted: 4/8/25 7:00pm Message 5 of 12
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Vette(s): Inherited a 1979 C3 350 Cubic inch.

Ok, here is the image



|UPDATED|4/8/2025 7:00:16 PM (AZT)|/UPDATED|



Re: Rear defrost black wire

Posted: 4/8/25 9:31pm Message 6 of 12
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

That wire should be soldered to the defroster grid on the glass. If you look in the area you'll see where it is supposed to go. I would be very careful if you decide to solder it back on...that glass can shatter quickly if heated to much at once. 




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Re: Rear defrost black wire

Posted: 4/10/25 6:34am Message 7 of 12
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France
Joined: 8/21/2002
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Vette(s): 1978 L48 Auto. Red with Oyster Leather interior. Owned since 1990.

Our '78 is an ex-Florida car an d the first owner apparently thought a defroster was not required - I wish he had visited Europe before ordering the car!  

But, soldering the wire onto the the defroster circuit sounds scary!   Just out of interest, is there another way to bond the wire to the defroster?   A purely academic question in my case, but I just wondered......🤔




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Re: Rear defrost black wire

Posted: 4/13/25 7:28pm Message 8 of 12
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Vette(s): 1971 LS6 COUPE, 1967 435HP COUPE 2024 Z06

Are you taking about the rear glass?




Re: Rear defrost black wire

Posted: 4/14/25 11:08am Message 9 of 12
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Grapevine, TX - USA
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Allen Van De Wege said:

Are you taking about the rear glass?


Re-read the OP.




   

Re: Rear defrost black wire

Posted: 4/14/25 6:23pm Message 10 of 12
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Vette(s): Inherited a 1979 C3 350 Cubic inch.

Thank you all for responding. I used JB Weld Steel stick epoxy and then took the T-tops of and held it down with a wood clamp. It worked really well and I did not need to solder.




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