2 Mystery Wires on passenger side of motor on my 72 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tekno62 · 06-20-2009, 10:41 PM

I was tugging on the wiring harness removing that black plastic tape around the wires when I noticed 2 wires that didn’t seem to be connected to anything. Ones black and about 12 ga and the other is a dark green with a white stripe. I was looking at the posted http://67-72chevytrucks.com/vboard/s...=185665&page=2 in boundstaffpress sig but cant seem to find the wire. I may have yanked them off of something.

Anyone got an idea what the wires went to..

**WorkinLonghorn** · 06-20-2009, 11:16 PM

Off the top I can't tell you by the colors, but the 72s had the lousy "TCS" transmission contolled spark system that had a wire or two going down to the trans. Lot's of people cut these wires so that their engines ran better.

Longhorn Man · 06-20-2009, 11:27 PM

yep, that started in 70 actually.
I can't remember the colors of the wires, but there would have been a temp sensor in the passenger side head, and a wire going to the vac switch that was mounted on the passenger side center on the intake.

westofb · 06-21-2009, 01:07 AM

Isn't that the colors of the wires running to the clutch on the a/c compressor? I am not sure, but am thinking those are the colors on the newer style (73 and up) trucks. Just my guess.

06-20-2009, 10:41 PM	#1
tekno62 Registered User Join Date: Nov 2008 Location: San Jose Ca Posts: 265	2 Mystery Wires on passenger side of motor on my 72 I was tugging on the wiring harness removing that black plastic tape around the wires when I noticed 2 wires that didn’t seem to be connected to anything. Ones black and about 12 ga and the other is a dark green with a white stripe. I was looking at the posted http://67-72chevytrucks.com/vboard/s...=185665&page=2 in boundstaffpress sig but cant seem to find the wire. I may have yanked them off of something. Anyone got an idea what the wires went to..

06-20-2009, 11:16 PM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 2 Mystery Wires on passenger side of motor on my 72 Off the top I can't tell you by the colors, but the 72s had the lousy "TCS" transmission contolled spark system that had a wire or two going down to the trans. Lot's of people cut these wires so that their engines ran better. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

06-20-2009, 11:27 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 2 Mystery Wires on passenger side of motor on my 72 yep, that started in 70 actually. I can't remember the colors of the wires, but there would have been a temp sensor in the passenger side head, and a wire going to the vac switch that was mounted on the passenger side center on the intake. Last edited by Longhorn Man; 06-20-2009 at 11:27 PM.

06-21-2009, 01:07 AM	#4
westofb I really hate wet sanding! Join Date: Dec 2008 Location: Brookfield, MO Posts: 601	Re: 2 Mystery Wires on passenger side of motor on my 72 Isn't that the colors of the wires running to the clutch on the a/c compressor? I am not sure, but am thinking those are the colors on the newer style (73 and up) trucks. Just my guess.



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