Wire harness plug identification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kevinr1970 · 08-03-2007, 03:18 PM

I thought I had posted this last night but can't find it - was this deleted for some reason?
I'll try again?

Helping a friend put a truck back together. 1986 GMC 4x4 1/2 ton with auto and AC. PO had disconnected the wire harness from the engine almost completely. It was all pulled off to the side.
We were able to find a spot for verything but one plug.

On the main harness that comes down the passenger side valve cover there is an extention that goes out farther than anything else. It goes out almost as far as the grill. This makes me think it should go back over the front of the engine, double back to the back of the engine or go over towards where the blower is mounted. I suppose it could follow the starter wires down behind the alternator too?
The plug is red in color and is at the end of a green wire with a yellow stripe and a light brown/tan wire with a dark brown stripe. The brown/tan might actually be pink but I can't tell. It has two male "plugs" on it that are about 1/8" or less in diameter and side by side.
There are actually three of these plugs that are shaped the same but the other two are black. One of these black plugs went to the smog pump and the other went to a "tower" that is mounted over the passenger valve cover towards the rear, next to and behind the EGR. The fitting had three vaccum hoses too.

I know its hard with no pictures but none are available

BTW, we did start the truck and drive around the yard/house but it is bothering me not knowing where this one goes.
Any help is appreciated!

Malo83 · 08-03-2007, 03:50 PM

Kevin on my 83 I have the same plug and it goes to the Elect. Purge Solenoid mounted on the Upper Alternator bracket

it is the solenoid at the very bottom of the pic, does this help you out any???
John

Malo83 · 08-03-2007, 03:55 PM

Here you can see the Red plug and solenoid right above the alternator, sorry for the bad shot but it was all I had

John

kevinr1970 · 08-03-2007, 07:40 PM

Thanks for the pic!
I don't think that there was something like that on the bracket but it might be someplace close.
If that is it it seems weird that it has so much extra wire though?

Ivan D. · 08-04-2007, 01:15 AM

Quote:

Originally Posted by kevinr1970

If that is it it seems weird that it has so much extra wire though?

You have to see the wire for the temp sensor in my truck, I had to wind it around the PCV like 10 times so it's down to a more manageable size. If left straight I bet I can run the wire all the way across the engine bay till it reaches the battery!

08-03-2007, 03:18 PM	#1
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Wire harness plug identification I thought I had posted this last night but can't find it - was this deleted for some reason? I'll try again? Helping a friend put a truck back together. 1986 GMC 4x4 1/2 ton with auto and AC. PO had disconnected the wire harness from the engine almost completely. It was all pulled off to the side. We were able to find a spot for verything but one plug. On the main harness that comes down the passenger side valve cover there is an extention that goes out farther than anything else. It goes out almost as far as the grill. This makes me think it should go back over the front of the engine, double back to the back of the engine or go over towards where the blower is mounted. I suppose it could follow the starter wires down behind the alternator too? The plug is red in color and is at the end of a green wire with a yellow stripe and a light brown/tan wire with a dark brown stripe. The brown/tan might actually be pink but I can't tell. It has two male "plugs" on it that are about 1/8" or less in diameter and side by side. There are actually three of these plugs that are shaped the same but the other two are black. One of these black plugs went to the smog pump and the other went to a "tower" that is mounted over the passenger valve cover towards the rear, next to and behind the EGR. The fitting had three vaccum hoses too. I know its hard with no pictures but none are available BTW, we did start the truck and drive around the yard/house but it is bothering me not knowing where this one goes. Any help is appreciated! __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

08-03-2007, 03:50 PM	#2
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Wire harness plug identification Kevin on my 83 I have the same plug and it goes to the Elect. Purge Solenoid mounted on the Upper Alternator bracket it is the solenoid at the very bottom of the pic, does this help you out any??? John

08-03-2007, 03:55 PM	#3
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Wire harness plug identification Here you can see the Red plug and solenoid right above the alternator, sorry for the bad shot but it was all I had John

08-03-2007, 07:40 PM	#4
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: Wire harness plug identification Thanks for the pic! I don't think that there was something like that on the bracket but it might be someplace close. If that is it it seems weird that it has so much extra wire though? __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)



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