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11-16-2017, 01:19 PM
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#1 |
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Registered User
 
Join Date: Dec 2011
Location: somerset ky
Posts: 63
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Mystery wiring harness
Wondering if any of you guys know what this harness goes to? It looks original to the truck but I can't find anything that it fits. Truck is a 72 custom 10 without air and a 307 v8 and 350 turbo transmission. The 2nd pic shows it coming into the cab and plugs into a relay. The 3rd pic shows the plugins.
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11-16-2017, 01:51 PM
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#2 |
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Senior Member
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: Mystery wiring harness
Looks like A/C connections
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11-16-2017, 01:55 PM
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#3 | |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
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Re: Mystery wiring harness
...............
Quote:
there is plenty of info on the forums about it, also google has lots of information. Most of the owners of our trucks have ripped it out since the engines run better without it. Some of the relays were mounted on the engine side firewall. You don't have AC but the AC relay was mounted in the airbox if I recall correctly. That would be the only other stock installed harness.
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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11-16-2017, 05:18 PM
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#4 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Mystery wiring harness
VetteVet is correct (not that he needs me to back him up) "just sayin"
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" 
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11-16-2017, 06:46 PM
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#5 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
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Re: Mystery wiring harness
I have a 1972 GMC that had the "Spark Knock" wiring as well. I removed it all without any problems.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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11-16-2017, 07:03 PM
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#6 |
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Registered User
Join Date: Oct 2017
Location: Wichita Kansas
Posts: 21
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Re: Mystery wiring harness
That wiring harness is a transmission control spark harness. It plugs into the TCS vacuum solenoid.
I hope this helps. ....the green wire goes to the temp sensor under the exhaust manifold on the drivers side I believe. Last edited by Grandpas 72; 11-16-2017 at 07:40 PM. Reason: Added content |
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11-17-2017, 12:52 AM
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#7 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Mystery wiring harness
Quote:
Interesting you should mention the green wire. What I found was a dark green wire that had been cut, and to-date I haven't been able to ID it. At any rate, I give up, what's a temp. sensor under an exhaust manifold? My truck also had a dark green wire that ran to the temp. sensor that fits into the head. But the wire came off the driver's side of the firewall block.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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11-17-2017, 03:32 AM
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#8 |
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Registered User
Join Date: Dec 2011
Location: somerset ky
Posts: 63
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Re: Mystery wiring harness
Guys I really appreciate the responses. The original engine is gone along with the emissions equipment. I wanted to remove this harness if it didn't have a reason to stay but I didn't want to remove something I may need.. I will go ahead and remove it and put a plug in that hole.
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