84 REGAL LIMITED REAR DEFROSTER

pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
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Kitchener, Ontario
#41
why would there not be any power to the breaker? That would mean something behind the fuse block of wiring burnt out. Nothing every indicated there was any smoke or short or burn....
if you are going to assume instead of a test good luck in tracking down the problem
 
S

Steve84

Apprentice
Jul 8, 2018
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18
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#42
if you are going to assume instead of a test good luck in tracking down the problem
You have a point. But when you don't know exactly which fuse to measure or what side for voltage, it sort of puts a damper on trying to fix it.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
24,758
10,223
113
Kitchener, Ontario
#44
there is no fuse for the rear defog, it is a 30 amp breaker circled in red, there will be a white wire feeding the rear defog in the yellow circle.

fuse-20diagram-jpg.102717
 
S

Steve84

Apprentice
Jul 8, 2018
79
18
8
#45
ah ha ! That should help me more. At least I can narrow down the area. Thanks pal, I will try this weekend god willing with weather.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
24,758
10,223
113
Kitchener, Ontario
#46
ah ha ! That should help me more. At least I can narrow down the area. Thanks pal, I will try this weekend god willing with weather.
have you not been approved by google yet to use their program?
 
S

Steve84

Apprentice
Jul 8, 2018
79
18
8
#47
there is no fuse for the rear defog, it is a 30 amp breaker circled in red, there will be a white wire feeding the rear defog in the yellow circle.

View attachment 102717

OK I spoke with the engineer here at work. He went to the GM Parts website and found out there is a TIMER RELAY for the defroster that is not in the switch. It goes with part # 25515822 (switch). The relay # is 10014885. Now does anyone know where this relay is located on my Regal? The schematic says location of relay is C181 and location of switch (25515822) is C182.
 

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pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
24,758
10,223
113
Kitchener, Ontario
#48
That diagram is from an older G body and probably isn't relevant to your car. I think the diagram 69hurstolds posted on page 1 is closer to your application.

if you checked the relay your engineer found you'd see it is not applicable to your vehicle.
https://www.wholesalegmpartsonline....LAY-Rear-WindowDefogger/2528542/10014885.html

This product fits 228 vehicle variants.
Buick: 1 models, 3 variants for 1982.
Chevrolet: 23 models, 105 variants between 1982 and 1991.
Oldsmobile: 8 models, 61 variants between 1982 and 1990.
Pontiac: 4 models, 59 variants between 1982 and 1987.
 
S

Steve84

Apprentice
Jul 8, 2018
79
18
8
#49
That diagram is from an older G body and probably isn't relevant to your car. I think the diagram 69hurstolds posted on page 1 is closer to your application.

if you checked the relay your engineer found you'd see it is not applicable to your vehicle.
https://www.wholesalegmpartsonline....LAY-Rear-WindowDefogger/2528542/10014885.html

This product fits 228 vehicle variants.
Buick: 1 models, 3 variants for 1982.
Chevrolet: 23 models, 105 variants between 1982 and 1991.
Oldsmobile: 8 models, 61 variants between 1982 and 1990.
Pontiac: 4 models, 59 variants between 1982 and 1987.

Then is it this RELAY?

https://www.rockauto.com/en/catalog...itch+&+relay,rear+window+defroster+relay,3432
 

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pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
24,758
10,223
113
Kitchener, Ontario
#50
That is listed for an 84 Monte Carlo so I have no idea if that fits your application. Have you removed any of the dash to try to test for current and to trace wires to see where and if there is an relay other than the one in the fuse box? Have you tested to see if there is any current at the back window when you have the rear defog on?
 

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