A question about that harness in the middle of the firewall... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TylerW · 07-20-2014, 01:39 PM

Hey guys:

I am restoring a 1979 Scottsdale SWB with the usual 350-4bbl. When I got it, it had been modified with different carb, intake and valve covers, so a lot of detail items were missing and also, some of the wiring disconnected.

On my truck and others like it I looked at in the junkyard, there is a small harness that exists roughly center of the firewall, about a foot above the distributor with 2 green wires. That harness extends out several inches, then there is a black plug connector.

After the plug-in, part of the harness goes to the A/C compressor, but what the other wire does is a mystery. On my truck it was cut, and on a harness I got to repair it, everything on the top of the engine was gone, so no help there.

The only thing I can think of on that engine that would require power is the idle-kickup solenoid on the carb. Am I on the right track?

Thanks!

buddy_1 · 07-20-2014, 01:45 PM

You are correct, the extra wire should go to the idle stepper solenoid.

TylerW · 07-20-2014, 02:49 PM

Big help,thank you

bark · 07-20-2014, 03:34 PM

So now the next question, can you get the idle up solenoid to work on a 1406 edelbrock carb?

Sorry for the hijack

07-20-2014, 01:39 PM	#1
TylerW Registered User Join Date: Jul 2014 Location: Huntsville, Al Posts: 16	A question about that harness in the middle of the firewall... Hey guys: I am restoring a 1979 Scottsdale SWB with the usual 350-4bbl. When I got it, it had been modified with different carb, intake and valve covers, so a lot of detail items were missing and also, some of the wiring disconnected. On my truck and others like it I looked at in the junkyard, there is a small harness that exists roughly center of the firewall, about a foot above the distributor with 2 green wires. That harness extends out several inches, then there is a black plug connector. After the plug-in, part of the harness goes to the A/C compressor, but what the other wire does is a mystery. On my truck it was cut, and on a harness I got to repair it, everything on the top of the engine was gone, so no help there. The only thing I can think of on that engine that would require power is the idle-kickup solenoid on the carb. Am I on the right track? Thanks!

07-20-2014, 01:45 PM	#2
buddy_1 Registered User Join Date: Dec 2013 Location: Humble, Texas Posts: 185	Re: A question about that harness in the middle of the firewall... You are correct, the extra wire should go to the idle stepper solenoid. __________________ I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400

07-20-2014, 02:49 PM	#3
TylerW Registered User Join Date: Jul 2014 Location: Huntsville, Al Posts: 16	Re: A question about that harness in the middle of the firewall... Big help,thank you

07-20-2014, 03:34 PM	#4
bark Registered User Join Date: Jun 2010 Location: Manitoba Posts: 223	Re: A question about that harness in the middle of the firewall... So now the next question, can you get the idle up solenoid to work on a 1406 edelbrock carb? Sorry for the hijack



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