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#1 |
Registered User
Join Date: Sep 2013
Location: Browns Mills, NJ
Posts: 11
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250 wiring question
I recently acquired a 72 c10 Longbed 3OTT with no engine. The truck was originally a 250 so I found a running 250 from a 67 and put that in. I'm trying to hook up the harness and I have a few that don't seem to have a home. These don't appear on the generic 67-72 wiring diagrams and I can't seem to locate a 72 specific diagram. I was hoping someone could give me a direction.
The harness coming off the bulkhead has 3 legs. One runs down the belhousing to the starter and oil pressure switch. No brainer. Second runs along the passenger side of the valve cover adn around to the coolant temp sensor, but there is another wire that's positioned as if it goes to the carb(Picture 1). Electric choke maybe? But the big mystery is a third leg that clips to the second and runs along the valve cover but has a single terminla connector and a dual terminal connector(Pciture 2) ![]() ![]() Also, the third leg has a black wire at the back of the valve cover that has been snipped off. Any help would be greatly appreciated. |
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#2 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,282
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Re: 250 wiring question
Looks like it could be a later-model alternator [SI] connector. Or a TCS [Terminal Controlled Spark] smog-related connection they had on '71s and '72s?
Not sure at all. If you shift this Q to the Electrical page, member Vette Vet would probably know, for sure.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#3 |
Registered User
Join Date: Jul 2010
Location: Willingboro, NJ
Posts: 489
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Re: 250 wiring question
Agreed that it looks like the TCS circuit. My 72 "had" it but it has since been removed. Good to see another 72' in New Jersey.
88Ironduke
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Retired USAF - No rockets, no mortars, no bad guys shooting...No stress!!! ![]() My Build Thread: Project 72' Green http://67-72chevytrucks.com/vboard/s...d.php?t=587932 |
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#4 |
Registered User
Join Date: Sep 2013
Location: Browns Mills, NJ
Posts: 11
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Re: 250 wiring question
Thanks. I thought it might be emissions related. That gives
something to look into |
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#5 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,282
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Re: 250 wiring question
Are you required to restore it as per your state's air quality regulations, or can you delete it? I would leave it out if legally possible. In California, the DMV requires all that archaic smog stuff to be onboard and working. Even if it did little at all for real air quality and was just a legislative band-aid. In Arizona, you can delete it, but all vehicles '67-and-newer are required to pass emission standards by the MVD.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#6 |
Registered User
Join Date: Sep 2013
Location: Browns Mills, NJ
Posts: 11
|
Re: 250 wiring question
I dont have any of the hardware so i just removed the harness and relay. New Jersey dorsnt realy care about emissions equiptment except catalytic converters. If it had a cat from the factoru it had to have it for emissions insoection so deleting it is no problem
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