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#1 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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New wiring harness help
I installed a 396 in place of the original small block. The new engine wiring harness has this pink wire in the harness near the left temp sender. I can’t figure what it is for as the green temp sender wire is there for the sender.
ps: the photo reversed itself.
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Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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#2 |
Registered User
Join Date: May 2015
Location: st louis missouri
Posts: 27
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Re: New wiring harness help
On my American Autowire kit, the pink wire was for the HEI distributor I used.
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#3 |
Registered User
Join Date: Jul 2014
Location: phx az
Posts: 324
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Re: New wiring harness help
yessir
since the dawn of time the pink should be power to distributor. check it with a testlight
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tubbed 1984 gmc jmmy http://67-72chevytrucks.com/vboard/s...d.php?t=639738 Alice Hombre http://67-72chevytrucks.com/vboard/s...d.php?t=808454 1963 Scout Retro-mod https://67-72chevytrucks.com/vboard/...d.php?t=854167 |
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#4 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,482
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Re: New wiring harness help
That's not the right kind of connector for HEI. If you ordered a harness for a truck with A/C, then that wire may be for a carb-mounted idle stop solenoid that bumps up the engine RPM when the A/C compressor is engaged.
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#5 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,240
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Re: New wiring harness help
What Moreland said. Though I thought it was for a anti-dieseling. Regardless, I cut it off. The connector for HEI is white.
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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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#6 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,528
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Re: New wiring harness help
Don't cut it off directly. Follow it back to the bulkhead connector and remove the wire there
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#7 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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Re: New wiring harness help
Thanks for the info, I will check to see when it has power. It is too short to reach back to the HEI. It comes out of the loom between #3 and #5 cylinder, so I am leaning to a carb solenoid. I will report back.
__________________
Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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#8 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,707
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Re: New wiring harness help
Another thing to get switched power in the area of the carburetor is carburetor-mounted TH400 transmission kickdown switch. I would think the manufacturer of the new wiring harness should be able to tell exactly what they intended you to use that plug for.
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#9 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,489
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Re: New wiring harness help
Quote:
I would not suggest cutting off a connector unless you are absolutely sure you'll never need it.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#10 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,702
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Re: New wiring harness help
A good rule of thumb when installing aftermarket products.. When all else fails, read the instruction manual.. In other words, contact the manufacturer..
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#11 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: New wiring harness help
The Pink wire is for the fast idle solenoid located at the front of the carb. It is the single spade plug- pink wire, purpose is to kick up fast idle when A/C is running. It is shrouded in the asphalt loom to protect from heat generated on intake manifold. The correct solenoid /bracket and screw can be a difficult find if missing. There is a an aftermarket delco type that is shorter but serves the same function. it may also have the bracket as well. The plunger is adjusted via the nut at the head of the solenoid to increase rpm at idle a few 100 rpm while air is on.
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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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#12 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,489
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Re: New wiring harness help
I forgot about that! They're also available for Holley and Edelbrock carbs, but are ridiculously expensive.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#13 |
Senior Member
![]() Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 710
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Re: New wiring harness help
I had the same question a couple of months ago.
https://67-72chevytrucks.com/vboard/...d.php?t=848442 The original harness had the same connector. The truck was already partially torn apart so I couldn't verify where it went to. As suggested by others it could be used as an idle stop solenoid, but not for the AC kickup as it's always powered when the engine is running. I don't know why such a large gauge wire would be needed for that function. It is connected to the same terminal at the firewall bulkhead connector as the coil resistor wire. My plan is to cut open that part of the harness and reroute it for use with the HEI.
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1966 C10 Custom Cab Restomod (Sold) 1969 Camaro Z/28 (Keeper) Current Build: 1968 C10 (Semi-Factory Restoration) 1983 Camaro Z/28 (Next in line, Keeper) 1951 3100 (2nd in line) |
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#14 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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Re: New wiring harness help
I checked it and it has key on power and will reach to the carb where an anti dieseling solenoid would have been installed. Now I have an extra power lead if I ever need one.
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Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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#15 |
Senior Member
![]() Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 710
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Re: New wiring harness help
Just remember, it's unfused.
__________________
1966 C10 Custom Cab Restomod (Sold) 1969 Camaro Z/28 (Keeper) Current Build: 1968 C10 (Semi-Factory Restoration) 1983 Camaro Z/28 (Next in line, Keeper) 1951 3100 (2nd in line) |
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#16 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
|
Re: New wiring harness help
__________________
Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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#17 | ||
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,240
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Re: New wiring harness help
Quote:
![]() Quote:
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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 Last edited by 71CHEVYSHORTBED402; 01-23-2024 at 11:38 AM. |
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#18 |
Registered User
Join Date: Oct 2013
Location: Lincoln, NE
Posts: 115
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Re: New wiring harness help
I used that wire for an electric choke.
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#19 |
425hp409
![]() Join Date: Oct 2008
Location: Prosper Texas
Posts: 841
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Re: New wiring harness help
That is a good use for it.
__________________
Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette |
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