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11-02-2023, 08:42 PM
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#1 |
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Senior Member
 
Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 692
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Mystery Pink Wire in Engine Compartment
When I disassembled this 68 there was a 12ga wire with a Packard connector on the end. It ran along the top of the driver side of the engine. The entire engine bay harness was a mess and this connector was just hanging.
It comes out of the firewall bulkhead at the same cavity as the coil resistor wire which means it's an ignition circuit. BTW, the new harness has the same wire. None of the diagrams I have seen show this wire. Any ideas? |
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11-02-2023, 10:15 PM
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#2 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,221
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Re: Mystery Pink Wire in Engine Compartment
Could be the HEI ignition power wire. That won't show up on our older wiring diagrams.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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11-02-2023, 10:47 PM
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#3 |
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Senior Member
Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 692
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Re: Mystery Pink Wire in Engine Compartment
Thanks.
While this would make a good power source for an HEI, it doesn't need to be this long for that. Keep in mind this wire is also on the original harness. |
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11-03-2023, 12:31 AM
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#4 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 449
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Re: Mystery Pink Wire in Engine Compartment
fuel gauge?
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11-03-2023, 12:42 AM
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#5 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 449
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Re: Mystery Pink Wire in Engine Compartment
better view here:
https://drive.google.com/file/d/130h...VyR/view?pli=1 |
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11-03-2023, 01:23 AM
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#6 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,180
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Re: Mystery Pink Wire in Engine Compartment
Quote:
Seems 71-72 AC cabs had an anti-dieseling relay mounted to the dash, and a mystery part located somewhere under the hood. Come to think of it, here's an 1971 M&H engine harness built for an HEI distributor. They throw all kinds of wires at it, modify as you need to.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring the truck from ground up. With assys, the guide accts for 1000s details, OEM identifications & part numbers, written in short order. 700+ images of assm., illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 11-03-2023 at 01:46 AM. |
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11-03-2023, 07:14 AM
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#7 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,243
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Re: Mystery Pink Wire in Engine Compartment
It's for an idle stop solenoid. Should be hot with key on.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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11-06-2023, 07:46 PM
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#8 |
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Senior Member
Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 692
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Re: Mystery Pink Wire in Engine Compartment
That sounds logical, although that's a big wire just for a solenoid. The truck does have factory AC but there wasn't a solenoid installed on the carb when I tore it down.
No matter, it's getting EFI so I'll save it for another possible function. Thanks for the help guys. |
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11-06-2023, 07:48 PM
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#9 | |
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Senior Member
Join Date: Sep 2002
Location: Alamogordo, NM
Posts: 692
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Re: Mystery Pink Wire in Engine Compartment
Quote:
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