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1981 Rear window defogger

Nobody Cares

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Oct 7, 2006
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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
Trying to trace the problem with the rear window defogger on the 81. Sometimes it will work (not very often ). Is there a breaker to check and where is the breaker located ?? Just one of those things that bugs me not working. Dave
:hb



:w
 

bill81vette

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Troy,NY
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1981 dark blue metallic
Dave,I'll check on the breaker...but in the mean time check to make sure the ground is good,lots of times that is a problem with these vettes,due to age and corrosion I believe it is behind the overhead panels behind the t-tops..
 

Nobody Cares

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421
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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
I'll do a check on the ground Bill. If i am right there is a 30 or 35 amp circuit breaker some where , just not sure where .

Probably not for a few days though. Highs the next few days is only around 6 to 8 degrees and lows well below zero at night.
:beer

:w
 

Tom Bryant

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1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
I had to replace the switch on ours several years ago but it failed completely. An intermittent problem may be harder to trace down. I'd start by checking all of the connections including the ground as mentioned above.

Tom
 

Yoda

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Amarillo, TX
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1981 UL5
:w Dave,

The Circuit Breaker is located on the fuse panel, you can see it below, it is the CB 35 amp box ;)

I agree with Bill & Tom ;) connections, connections, connections also contact points of the switch ;) it could be something as simple as the plug at the defog on connection at the window film ;)

attachment.php

Bud
 

Nobody Cares

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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
Thanks for the fuse panel diagram Bud. I'll checks things out first chance i get (connections ) Dave :w
 

bill81vette

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Troy,NY
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1981 dark blue metallic
I don't know if there is a relay for it unless it's in the switch....
 

jdp6000

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Aug 23, 2004
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646
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Aurora, Ontario, Canada
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1982 CROSSFIRE
My mistake. No relay. Just a connector in the rear left quarter panel.

Diagram shows 30 amp fuse for the defrost on circuit with orange and black wire. Guage fuse also has something to do with it on the pink/black wire. Coming out of the switch is a black to ground. a purple that goes to the connector in the rear left quarter and switches to a black which terminates at the grid.

Check your grid lines on the window a worn one could cause a problem.

Jim
 

jdp6000

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646
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Aurora, Ontario, Canada
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1982 CROSSFIRE
Just looked in a spare I have. There is a built in delay. Maybe the contacts are bent out of place on yours. You may have to open it up and try to fix it.

Jim
 

Nobody Cares

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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
Thnx again Jim. I'll check it out. I really haven't done much outside in the garage lately, been way too COLD. :beer Dave













:w
 

Vette79

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1979 L-48 Black Coupe
Please keep me posted as well seeings how I am having the same exact problem...Thanks.
 

Nobody Cares

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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
Sure will. Should be able to get the car out this weekend and take a look. Dave:beer
 

Vette79

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Millersville, MD
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1979 L-48 Black Coupe
I am going to do this as well. Hope mine is as simple as a connection.
 

Nobody Cares

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Higgins Lake , Michigan
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red 81, orange 74 vert. , 80 claret,69 chevy pu
Hope it is that simple. Just one of those things that bugs me if it's not working. Dave:w
 

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