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#1 |
Junior Member
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Location: Regina, Saskatchewan
Posts: 83
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wiring harness
is the underhood wiring harness in a 1970 chev the same as a 1971 chev both trucks had full gauges ?is there a difference between a big block and small block harness?
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#2 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,394
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Re: wiring harness
I expect the wiring harnesses should be similar. Look around at different engines. Some year they switched sides with the alternator. '70 and '71 should be pretty close, but depending on end user, there may be emission controls on one but not the other. If you can, put the vehicles next to each other and do a "what is wrong with this picture?" exercise.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#3 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,074
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Re: wiring harness
There are two underhood harnesses. One goes to the engine and the other crosses the radiator.
I'd go to wiringharness.com and check the part numbers, engine applications, and years. |
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#4 |
Account Suspended
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Location: Tacoma, WA
Posts: 6,873
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Re: wiring harness
The wiring harnesses for the engine are the same both years. Big block is different, the starter wires are much longer as they are routed along the intake to the front of the engine then down by the oil pan to the starter. The temp wire is a little shorter on a big block and has a metal retainer for the back of the head. You can make it work, same wires just different routing.
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#5 | |
Who Changed This?
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Location: Simi Valley, CA
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Re: wiring harness
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#6 |
Account Suspended
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Location: Tacoma, WA
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Re: wiring harness
I think all years of big block are routed that way.
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#7 |
Who Changed This?
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Location: Simi Valley, CA
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Re: wiring harness
I've never seen that. Looking at pages 323 and 395 of the Factory Assembly Instruction Manual, it shows the wiring running along the cowl and along the back of the block to the starter.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#8 | |
Account Suspended
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Location: Tacoma, WA
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Re: wiring harness
Quote:
Assembly manual also shows temp sensor at thermostat too and over speed switch by carburetor(c60 stuff) http://67-72chevytrucks.com/vboard/s...d.php?t=442467 |
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#9 |
Who Changed This?
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Location: Simi Valley, CA
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Re: wiring harness
OK, then. Never seen it is all. I wonder why they were routed two different ways?
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#10 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: wiring harness
Id like to be able to get an engine harness that doesn't have the emission controls wiring. Do they sell a replacement one that plugs in and has just the needed wires and not the emission wires?
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#11 | |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: wiring harness
Quote:
![]() https://www.inlinetube.com/products/inl10377 original taping method https://www.youtube.com/watch?v=MehjltOq-jc lectriclimited harnesses https://www.lectriclimited.com/vehic...ke/21/model/56
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#12 |
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Location: Tacoma, WA
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Re: wiring harness
The emissiins is only tcs, transmission controlled spark and its a seperate harness.
There are only a few engine harness wires and all are needed. |
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#13 |
Account Suspended
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Location: Tacoma, WA
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Re: wiring harness
I found my big block engine harness, pictures here.
http://67-72chevytrucks.com/vboard/s...72#post8548372 |
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