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07-13-2013, 12:53 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Mesa, AZ
Posts: 173
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Identify this harness
I have a pretty hacked harness that I can't identify. Can anybody help? It appears to run through the firewall based on the grommet, but for the life of me I can't remember what it hooks to.
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72 SWB 2WD, complete frame off resto |
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07-13-2013, 01:01 PM
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#2 |
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Registered User
Join Date: Jan 2003
Location: Mesa, AZ
Posts: 173
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Re: Identify this harness
FYI- This is a 1972 Chevy, 2WD with A/C and guages
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72 SWB 2WD, complete frame off resto |
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07-13-2013, 01:20 PM
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#3 |
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Senior Member
 
Join Date: Oct 2010
Location: Cadiz, Ky
Posts: 512
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Re: Identify this harness
That grommet is puzzling. I don't have A/C but nothing goes back thru the firewall on mine from the harness. If you have an assembly manual that might help you. Sorry I don't have an answer for you.
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1972 Chevy LWB Roadster 1999 Chevy Silverado 2wd 2015 Chevy High Country 4x4 Crew Cab |
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07-13-2013, 04:26 PM
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#4 |
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Scrapper 1
Join Date: Jan 2007
Location: Riverside Calif
Posts: 1,649
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Re: Identify this harness
that is the alternator harness and regulator harness and some of the grounds
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07-13-2013, 07:46 PM
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#5 |
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Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Identify this harness
Actually it is the tcs harness- transistor controlled spark. At some point there was a pair of relays and a vac. Pull off that connected between the distributed and carb and wire to trans that limited full vac. Advance until in high gear. Early emissions control and not needed u less you really want it.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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07-13-2013, 07:56 PM
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#6 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Identify this harness
TCS harness, (Transmission Controlled Spark). This controlled the vacuum advance so that it would not advance until the engine was at a set temperature and the transmission was in high gear. It could also been tied in with the carburetor solenoid if the vehicle was equipped with one.
It could be very detrimental to the performance and mileage of the truck. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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07-13-2013, 08:31 PM
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#7 |
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Registered User
Join Date: Jan 2003
Location: Mesa, AZ
Posts: 173
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Re: Identify this harness
Thanks guys for the info. Was this some kind of option or standard equipment? The hole in the firewall doesn't seem to be in any of the pictures I've searched on this forum. In some cases there is a hole for the tach harness but it's location is not the same. I guess I'll just try to find some kind of plug for the hole and toss that mess of wires.
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