72 c10 a/c wiring harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Hidesertchevy** · 11-05-2020, 10:59 PM

Can anyone tell me where the factory a/c harness plugs into the fuse panel? I have a new m&h harness. Thanks

RustyPile · 11-05-2020, 11:56 PM

Quote:

Originally Posted by Hidesertchevy

Can anyone tell me where the factory a/c harness plugs into the fuse panel? I have a new m&h harness. Thanks

The 12 ga. Orange wire plugs in the fuse box terminal marked "cig lighter".. Remove existing fuse and replace with 25 amp fuse..

RustyPile · 11-06-2020, 12:02 AM

There's a pretty good discussion about factory A/C wiring and how it works on this thread.. Also, someone posted a nice factory A/C schematic..

http://67-72chevytrucks.com/vboard/s...d.php?t=813743

**Hidesertchevy** · 11-06-2020, 12:28 AM

My harness has a pink 12ga also at the fuse panel, where does this one go? Thanks

RustyPile · 11-06-2020, 05:40 PM

Quote:

Originally Posted by Hidesertchevy

My harness has a pink 12ga also at the fuse panel, where does this one go? Thanks

Are we talking about a pink wire in the A/C harness or in the cab main harness?? There is no pink wire in the factory A/C harness.. In the stock main harness or a correct color coded in cab replacement harness, the pink 12 ga. wire feeds the power from the ignition switch to the bulkhead connector where the ignition resistor wire is connected on the engine bay side.. On the way to the bulkhead connector, it branches off and goes to the fuse panel..

Typing out a description of where each wire in a harness connects can be a lengthy and complicated process.. I suggest you get a color wiring diagram to aid you in this project.. Go to the electrical forum and download a diagram..

**Hidesertchevy** · 11-06-2020, 06:27 PM

I'm talking about the pink wire in the AC harness. I just contacted m&h the manufacturer and they told me that it sounds like I have a 1971 harness that included the anti dieseling relay as part of the AC harness only found in 1971. My truck is a 1972. Thanks for the help fellas.

**Richard** · 11-06-2020, 06:55 PM

If I recall correctly the 72 AC harness has the TCS (transmission controlled spark) wiring with it.
Found a thread with the TCS wiring https://67-72chevytrucks.com/vboard/...&highlight=TCS It does use a pink wire

11-05-2020, 10:59 PM	#1
Hidesertchevy Senior Member Join Date: Mar 2017 Location: yucca valley Posts: 268	72 c10 a/c wiring harness Can anyone tell me where the factory a/c harness plugs into the fuse panel? I have a new m&h harness. Thanks

11-06-2020, 12:02 AM	#3
RustyPile Registered User Join Date: Dec 2017 Location: Elkhart, Texas Posts: 1,841	Re: 72 c10 a/c wiring harness There's a pretty good discussion about factory A/C wiring and how it works on this thread.. Also, someone posted a nice factory A/C schematic.. http://67-72chevytrucks.com/vboard/s...d.php?t=813743

11-06-2020, 12:28 AM	#4
Hidesertchevy Senior Member Join Date: Mar 2017 Location: yucca valley Posts: 268	Re: 72 c10 a/c wiring harness My harness has a pink 12ga also at the fuse panel, where does this one go? Thanks

11-06-2020, 06:27 PM	#6
Hidesertchevy Senior Member Join Date: Mar 2017 Location: yucca valley Posts: 268	Re: 72 c10 a/c wiring harness I'm talking about the pink wire in the AC harness. I just contacted m&h the manufacturer and they told me that it sounds like I have a 1971 harness that included the anti dieseling relay as part of the AC harness only found in 1971. My truck is a 1972. Thanks for the help fellas.

11-06-2020, 06:55 PM	#7
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,881	Re: 72 c10 a/c wiring harness If I recall correctly the 72 AC harness has the TCS (transmission controlled spark) wiring with it. Found a thread with the TCS wiring https://67-72chevytrucks.com/vboard/...&highlight=TCS It does use a pink wire __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 11-06-2020 at 07:01 PM.



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