72 cutlass firewall relay diagram

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Old May 6, 2025 | 08:49 AM
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72 cutlass firewall relay diagram

Hello! Good morning. I am trying to figure out which relays are mounted to the firewall and where they are mounted on the firewall. Do any of you have a car that you can take a picture of and send it to me? Or have a diagram of some sort? Thank you!
Old May 7, 2025 | 08:13 AM
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What options are on the car? A/C? Any high-current items like power windows or seats?
Old May 7, 2025 | 08:57 AM
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It does have A/C... Power Windows... That's all I can think ok.
Old May 7, 2025 | 02:55 PM
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Does the car have one of those fancy nylon tops which folds down behind the rear seat?
Old May 7, 2025 | 03:01 PM
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Originally Posted by Vintage Chief
Does the car have one of those fancy nylon tops which folds down behind the rear seat?
LOL, No, it does not. Hard top!
Old May 7, 2025 | 03:04 PM
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Originally Posted by Vintage Chief
Does the car have one of those fancy nylon tops which folds down behind the rear seat?
Doesn't matter, there isn't a relay for that.

The voltage regulator is the square black box nearly dead center on the firewall.
The horn relay is just to the driver's side of the regulator.
The A/C relay is outboard of the wiper motor on the far driver's side.
If you have the electric grid rear window defogger that relay will be below the regulator.
Old May 7, 2025 | 03:08 PM
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Originally Posted by joe_padavano
Doesn't matter, there isn't a relay for that.

The voltage regulator is the square black box nearly dead center on the firewall.
The horn relay is just to the driver's side of the regulator.
The A/C relay is outboard of the wiper motor on the far driver's side.
If you have the electric grid rear window defogger that relay will be below the regulator.

Yeah, yeah, yeah...I thought I recalled a difference in location for the A/C relay if it was a convertible....maybe I thunk about it wrong.
Old May 7, 2025 | 03:20 PM
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Joe - I'm being modestly glib, because after reviewing numerous PIM diagrams between 1971 & 1972, in particular, I thought I recalled modest changes of locations based on various components...give me second, I might find at least one such diagram.
Old May 7, 2025 | 03:31 PM
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OK. I won't bang my head against the wall doing a comparison of that Power Top circuit breaker location vs. the A/C relay between years, but I will toss up the diagrams for non-A/C vs. A/C firewall diagrams to accommodate what Joe has already stated.




Old May 7, 2025 | 03:43 PM
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Here's the rear window defogger relay diagram, FWIW.



Old May 8, 2025 | 06:20 AM
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The rear window defogger relay is the only one that changes position with A/C vs non-A/C, and since the OP said that he has A/C, I only provided that info. And yes, there were differences between 1971 and 72.
Old May 8, 2025 | 07:40 AM
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Originally Posted by joe_padavano
Doesn't matter, there isn't a relay for that.

The voltage regulator is the square black box nearly dead center on the firewall.
The horn relay is just to the driver's side of the regulator.
The A/C relay is outboard of the wiper motor on the far driver's side.
If you have the electric grid rear window defogger that relay will be below the regulator.
Thank you so much! Very informative!!! I appreciate your help and your time!

Originally Posted by Vintage Chief
Joe - I'm being modestly glib, because after reviewing numerous PIM diagrams between 1971 & 1972, in particular, I thought I recalled modest changes of locations based on various components...give me second, I might find at least one such diagram.
Thank you! I've always preferred picture books
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