84 REGAL LIMITED REAR DEFROSTER

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Steve84

Apprentice
Jul 8, 2018
60
11
8
#1
Hi everyone! Blower motor still working great ! Got another problem.

Would anyone know about the rear defrost system on an '84 Regal Limited? It has a rocker toggle switch. It is a temporary touch type meaning it does not stay in any on or off position. For the 20 years I have owned this Regal it always worked however sometimes I would have to tap it a couple of times for it to come on. There is a light that comes on when it is ON. Now it does not come on at all. Is there a fuse or relay I should check on the fuse block? If so, does anyone have a pic. of the proper fuse block so I can zero in on the right fuse or relay to check? If a relay, how do these relays come out? Just so you know I don't think there is any problem with grid or factory wiring. I NEVER changed anything or cut any wires. Any help would be appreciated. Thanks !

p.s. It may be the relay, I am seeing a photo of one and it appears it is NOT on the fuse block. Under the hood maybe? Because it seems there is a plug in harness to it???
 
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TURNA

TURNA

Geezer
Jul 24, 2009
5,281
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Socialist NY
#2
If you were tapping the switch to get it to work in the past I would say the switch is busted.
 
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Steve84

Apprentice
Jul 8, 2018
60
11
8
#3
But let's just say the relay is bad, where is it located? Because I did notice the light on the switch glow briefly when I press it but it does not fully stay on. If the switch is bad, would you have a part #?
 
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69hurstolds

69hurstolds

G-Body Guru
Jan 2, 2006
695
432
63
#5
Relay is solid state in the switch. At least it is on Cutlass. Here's an 85 Cutlass wiring diagram. I'm betting it's very close if not the same.

85-olds-g-body-defogger-circuit-jpg.99673

85-olds-g-body-defogger-circuit-component-locations-jpg.99674
 
69hurstolds

69hurstolds

G-Body Guru
Jan 2, 2006
695
432
63
#6
If it doesn't have the relay included, you're going to need to find a buick wiring diagram. Because I don't know Buicks. But if the relay is solid state and in the switch, you just need to find a new switch. If it's anything like Olds G-body defog switches, it's a crap shoot.
 
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Steve84

Apprentice
Jul 8, 2018
60
11
8
#7
If it doesn't have the relay included, you're going to need to find a buick wiring diagram. Because I don't know Buicks. But if the relay is solid state and in the switch, you just need to find a new switch. If it's anything like Olds G-body defog switches, it's a crap shoot.
I wish I had the part # without trying to remove the old one first....
 
S

Steve84

Apprentice
Jul 8, 2018
60
11
8
#8
If it doesn't have the relay included, you're going to need to find a buick wiring diagram. Because I don't know Buicks. But if the relay is solid state and in the switch, you just need to find a new switch. If it's anything like Olds G-body defog switches, it's a crap shoot.
Good news ,it appears the relay is IN the switch itself. It has a 5 plug harness that goes to it.
 
69hurstolds

69hurstolds

G-Body Guru
Jan 2, 2006
695
432
63
#9
25515822 is the best number I've found for the switch. And it has a big long box in back of it making be think it has the solid state timer in it. Discontinued 6 years ago. Made by Nartron. Oldsmobile used TRW switches. Go figure.

That's sorta good news, but the point now is FINDING one that works.
 

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