AC Control bulb socket question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Thealien** · 01-05-2022, 09:22 PM

I deleted the other thread because I couldn't even spell AC correctly.

I have been waiting about six months for an M & H under dash wiring harness. The AC harness only has one bulb socket for the AC controller. Does the other bulb socket come from the under dash harness or is that another separate small harness?

57taskforce · 01-05-2022, 09:58 PM

I recently dealt with this in my K20. Here’s a link to what I included in my build thread on it. My factory harness had the passenger side hvac bulb socket wrapped up and routed with the blower switch harness. The driver side came out of the main under dash harness right about where the wiper switch is. They both get power from the grey wire in the instrument cluster plug. I couldn’t get power to the passenger side bulb socket to save my life. There is a factory splice somewhere in the grey wire but rather than unwrap the harness I just tied it into the grey wire in a different more easy to access place. Everything works perfect now.

http://67-72chevytrucks.com/vboard/s...&postcount=317

68 P.O.S. · 01-07-2022, 01:29 PM

From what I recall, the heat only control panel only has one bulb, the AC panel has two bulbs.

01-05-2022, 09:22 PM	#1
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,135	AC Control bulb socket question I deleted the other thread because I couldn't even spell AC correctly. I have been waiting about six months for an M & H under dash wiring harness. The AC harness only has one bulb socket for the AC controller. Does the other bulb socket come from the under dash harness or is that another separate small harness? __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

01-05-2022, 09:58 PM	#2
57taskforce All about them K’s Join Date: Jun 2014 Location: Land of Entrapment Posts: 6,504	Re: AC Control bulb socket question I recently dealt with this in my K20. Here’s a link to what I included in my build thread on it. My factory harness had the passenger side hvac bulb socket wrapped up and routed with the blower switch harness. The driver side came out of the main under dash harness right about where the wiper switch is. They both get power from the grey wire in the instrument cluster plug. I couldn’t get power to the passenger side bulb socket to save my life. There is a factory splice somewhere in the grey wire but rather than unwrap the harness I just tied it into the grey wire in a different more easy to access place. Everything works perfect now. http://67-72chevytrucks.com/vboard/s...&postcount=317 __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s

01-07-2022, 01:29 PM	#3
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,662	Re: AC Control bulb socket question From what I recall, the heat only control panel only has one bulb, the AC panel has two bulbs. __________________ 72 C10 lwb fleetside -stock 350/350 combo



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