What are these 3 wires in my engine harness? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

flyin99 · 06-11-2002, 10:28 PM

I just want to make sure where these go...........

Benrs86 · 06-11-2002, 10:50 PM

is that a aftermarket wiring harness? it looks nice. i think green is water temperature sender. red maybe your automatic choke? dont know, im just guessin about the red one, but pretty sure that originally the temp sender wire is green. good luck, Ben

*Zkast* · 06-11-2002, 10:58 PM

Cory M has a diagram on his site that might help you...
http://www.geocities.com/chevroletc1070/wiringdias.html

The blue wire is for an oil pressure sending unit.
The Green wire's I believe are for AC compressor and Soleniod. Or for a temp sending unit near the thermostat housing ( Gm used green for both ac (light green) and temp sender wires(dark green)
The Pink hmmm nothing comes to mind right off hand. Possibly your old ignition coil + supply wire?

Blue_71 · 06-11-2002, 11:04 PM

i THINK green is temp, blue no clue, and pink no clue, but i do know that there not on my 71s harness. BUT they were on a 70 harness i had

flyin99 · 06-11-2002, 11:05 PM

I did buy it new.it is one of those M&M harnesses, that GMC Paul's sells......My factory harness didn't have an oil pressure light, or it had been cut......I am running gauges.....as for the pink one....this one is really confusing me......if it is laid out right............this wire wants to go to the front of the motor somewhere.......I dunno...........lol.......thanks for the help though

Benrs86 · 06-11-2002, 11:11 PM

get a voltameter, and figure out when it gets power, like with the key on, or put some volts to it and see if a guage moves? maybe that isnt a good idea. good luck tho, Ben

Mountain Man · 06-12-2002, 12:00 AM

The blue or the red wire might be the electric choke wire.

The green wire may be for a tach.

tom hand · 06-12-2002, 06:57 AM

If it is a stock harness I think the red one is for an anti-deseling solonoid that goes on the stock quadrajet.

rustfree · 06-12-2002, 03:55 PM

I went with M&H also and had the same questions. This is way it goes. There are 2 green wires for temp sender. One plug works with warning light type sender the other works on gauge type. The pink/red goes to the solinoid on q-jet carb and the blue would go to oil pressure sender if you only had warning light and not gauge. I just cut off wires not needed and went with it.

BTW M&H uses only factory color/gauge and connectors in their replacement harness's, just the way it should be!

06-11-2002, 10:28 PM	#1
flyin99 creator of kong Join Date: Mar 2001 Location: Kentucky Posts: 538	What are these 3 wires in my engine harness? I just want to make sure where these go........... Attached Images

06-11-2002, 10:50 PM	#2
Benrs86 Registered User Join Date: Feb 2000 Location: Brandon, SD, USA Posts: 1,292	is that a aftermarket wiring harness? it looks nice. i think green is water temperature sender. red maybe your automatic choke? dont know, im just guessin about the red one, but pretty sure that originally the temp sender wire is green. good luck, Ben __________________ Brandon, SD 69 GMC 1/2 ton 2wd wide long bed with wood 3 on the tree 350 engine 4 bolt main rv cam AIM = Alphray04

06-11-2002, 11:11 PM	#6
Benrs86 Registered User Join Date: Feb 2000 Location: Brandon, SD, USA Posts: 1,292	get a voltameter, and figure out when it gets power, like with the key on, or put some volts to it and see if a guage moves? maybe that isnt a good idea. good luck tho, Ben __________________ Brandon, SD 69 GMC 1/2 ton 2wd wide long bed with wood 3 on the tree 350 engine 4 bolt main rv cam AIM = Alphray04

06-12-2002, 12:00 AM	#7
Mountain Man Registered User Join Date: Jan 2002 Location: Calgary, Alberta, Canada Posts: 451	The blue or the red wire might be the electric choke wire. The green wire may be for a tach. __________________ 72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components.

06-12-2002, 06:57 AM	#8
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	If it is a stock harness I think the red one is for an anti-deseling solonoid that goes on the stock quadrajet. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

06-11-2002, 10:58 PM	#3
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Cory M has a diagram on his site that might help you... http://www.geocities.com/chevroletc1070/wiringdias.html The blue wire is for an oil pressure sending unit. The Green wire's I believe are for AC compressor and Soleniod. Or for a temp sending unit near the thermostat housing ( Gm used green for both ac (light green) and temp sender wires(dark green) The Pink hmmm nothing comes to mind right off hand. Possibly your old ignition coil + supply wire?

06-11-2002, 11:05 PM	#5
flyin99 creator of kong Join Date: Mar 2001 Location: Kentucky Posts: 538	I did buy it new.it is one of those M&M harnesses, that GMC Paul's sells......My factory harness didn't have an oil pressure light, or it had been cut......I am running gauges.....as for the pink one....this one is really confusing me......if it is laid out right............this wire wants to go to the front of the motor somewhere.......I dunno...........lol.......thanks for the help though

06-12-2002, 03:55 PM	#9
rustfree Registered User Join Date: May 2001 Location: Warren, OR , USA Posts: 166	I went with M&H also and had the same questions. This is way it goes. There are 2 green wires for temp sender. One plug works with warning light type sender the other works on gauge type. The pink/red goes to the solinoid on q-jet carb and the blue would go to oil pressure sender if you only had warning light and not gauge. I just cut off wires not needed and went with it. BTW M&H uses only factory color/gauge and connectors in their replacement harness's, just the way it should be! __________________ 72 swb cheyenne super 350/350 69 cst20 BB longhorn Warren, OR



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