The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - AC compressor relay and Trinary switch wiring question

kglowacky · 09-27-2021, 05:11 PM

going thru the same process of getting my ac working. when I got my harness back from the rebuilder he left a wire on it saying AC. I called and asked why he left it on there because I said no to ac on the build. He said they made a mistake just ignore it. Now I am wondering if he didn't do me a favor by leaving it. My question is is this wire connect to 12v or a ground or does it connect to the compressor and the compressor tell the ECM to increase rpms to handle the extra load. or connect to a relay terminal. Assume it is pin#17.

09-27-2021, 05:11 PM	#6
kglowacky Registered User Join Date: Mar 2020 Location: The Woodlands,Tx Posts: 561	Re: AC compressor relay and Trinary switch wiring question going thru the same process of getting my ac working. when I got my harness back from the rebuilder he left a wire on it saying AC. I called and asked why he left it on there because I said no to ac on the build. He said they made a mistake just ignore it. Now I am wondering if he didn't do me a favor by leaving it. My question is is this wire connect to 12v or a ground or does it connect to the compressor and the compressor tell the ECM to increase rpms to handle the extra load. or connect to a relay terminal. Assume it is pin#17.