Rear-Defrost Relay
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Rear-Defrost Relay
Does anyone know of a replacement p/n for the rear-defrost relay? I can only find used ones on Ebay and I don't trust 30 year old relays..lol The relay under the passenger dash, not the on/off button.
My issues is my rear-defrost doesn't stay on more than 2 min at a time. Doing research here on the boards I've come to the conclusion that my issue is the relay. It still "clicks" when I turn it on and off, but it should stay on for much longer than 2 min at a time.
My issues is my rear-defrost doesn't stay on more than 2 min at a time. Doing research here on the boards I've come to the conclusion that my issue is the relay. It still "clicks" when I turn it on and off, but it should stay on for much longer than 2 min at a time.
Last edited by Ozz1967; Nov 15, 2013 at 08:34 PM.
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Rear-Defrost Relay
No one knows of a good replacement relay for the rear defrost?
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Time Out
You won’t find one unless it’s dealer NOS.
If the 2 minutes is repeatable it’s not the fault of the relay, it’s the timer.
The following circuit can replace your defective timer:
C1 and R1 control the amount of time.
Start with 270μf* for C1, and 8.2K* for R1.
I estimate 5 minutes for the aforementioned.
If more time is desired increase C1 and or R1.
To make it easy you can use a potentiometer for R1 so you can dial in the time wanted.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
*Or the closest you can get.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
If the 2 minutes is repeatable it’s not the fault of the relay, it’s the timer.
The following circuit can replace your defective timer:
C1 and R1 control the amount of time.
Start with 270μf* for C1, and 8.2K* for R1.
I estimate 5 minutes for the aforementioned.
If more time is desired increase C1 and or R1.
To make it easy you can use a potentiometer for R1 so you can dial in the time wanted.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
*Or the closest you can get.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Time Out
You won’t find one unless it’s dealer NOS.
If the 2 minutes is repeatable it’s not the fault of the relay, it’s the timer.
The following circuit can replace your defective timer:
C1 and R1 control the amount of time.
Start with 270μf* for C1, and 8.2K* for R1.
I estimate 5 minutes for the aforementioned.
If more time is desired increase C1 and or R1.
To make it easy you can use a potentiometer for R1 so you can dial in the time wanted.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
*Or the closest you can get.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
If the 2 minutes is repeatable it’s not the fault of the relay, it’s the timer.
The following circuit can replace your defective timer:
C1 and R1 control the amount of time.
Start with 270μf* for C1, and 8.2K* for R1.
I estimate 5 minutes for the aforementioned.
If more time is desired increase C1 and or R1.
To make it easy you can use a potentiometer for R1 so you can dial in the time wanted.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
*Or the closest you can get.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Time Out
Yes so it might be easier to replace the relay and timer.
Nomenclature evolves and people refer to the entire assembly as a ‘relay’.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
Nomenclature evolves and people refer to the entire assembly as a ‘relay’.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Even Tho I Might Destroy The Car During The Race, At Least It Looks Gorgeous At The Start
Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Rear-Defrost Relay
I’m also looking for a timer, or at least I was. It rained today so I thought I would give it another try. The darn thing worked. The light was on at least 5 min. and I could slowly start to see through the window. How long it will last is another story.
Last edited by Ron U.S.M.C.; Nov 19, 2013 at 06:14 PM.
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Rear-Defrost Relay
This could be a roll of the dice =
82 92 Camaro Firebird Rear Hatch Defrost Relay Timer | eBay
82 92 Camaro Firebird Rear Hatch Defrost Relay Timer | eBay
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