1972 Gmc Jimmy Wire Identification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Sandtrap9072** · 01-15-2016, 09:33 PM

So, I am cleaning up some wiring in the engine compartment and came to a purple wire that was spliced into a red wire that runs to the starter. Can anyone tell me what their purple wire runs to, this doesn't seem right? Please see attached pictures. Also, where the red and purple wires are spliced, there is a green wire and a black wire that are cut, does anyone know where these are supposed to run to? Any help would be greatly appreciated.

**jaros44sr** · 01-15-2016, 10:55 PM

sandtrap, not to put you off, but I don't know the answer to your question. But, I do know that if you drop down into the electrical section there is a colored wiring diagram of the entire wiring harness. I will follow along to make sure you get it sharpened out. Please post a follow up, so I can see where you ended up

To many whiskies to type

hemi43 · 01-16-2016, 10:24 AM

Purple wire comes from the starter switch (hot on start) then goes to the neutral safety switch at the bottom of column,and then goes to the solenoid on the starter. My guess is that the original wire got damaged because it's near the exhaust, so the previous owner spliced in the new red wire.

**Sandtrap9072** · 01-16-2016, 10:26 AM

Sweet, thanks guys. What about the green and black wire shown in the second picture?

hemi43 · 01-16-2016, 12:33 PM

Quote:

Originally Posted by Sandtrap9072

Sweet, thanks guys. What about the green and black wire shown in the second picture?

I tried to find out, but since my truck is a 70 it's a bit different. I have a feeling it may be for emission controls but I'm not sure, sorry.

ls1nova71 · 01-16-2016, 01:11 PM

Green wire looks like the temp sender wire. As for the black one, you'll have to trace it back and see where it goes. If it goes into the bulkhead connector, post a pic of where and we can figure it out from there. I would also trace the green one to make sure it goes to the bulkhead too, it's just with that aftermarket wire loom you never know what a previous owner could have put in there.

87Skier · 01-16-2016, 07:28 PM

Mine had a TCS (transmission controlled spark) module but most of the components were missing. It came out about where you were talking about. I redid my wiring and eliminated this stuff.

Look at this link:
http://67-72chevytrucks.com/vboard/s...d.php?t=196397

**Sandtrap9072** · 01-18-2016, 01:05 PM

Thanks for all of your helps fellas, i haven't been able to make it back out into the garage lately. But when i do ill look into the black wire.

01-15-2016, 09:33 PM	#1
Sandtrap9072 Registered User Join Date: Apr 2012 Location: Michigan Posts: 389	1972 Gmc Jimmy Wire Identification So, I am cleaning up some wiring in the engine compartment and came to a purple wire that was spliced into a red wire that runs to the starter. Can anyone tell me what their purple wire runs to, this doesn't seem right? Please see attached pictures. Also, where the red and purple wires are spliced, there is a green wire and a black wire that are cut, does anyone know where these are supposed to run to? Any help would be greatly appreciated. Attached Images Last edited by Sandtrap9072; 01-15-2016 at 10:10 PM.

01-15-2016, 10:55 PM	#2
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,704	Re: 1972 Gmc Jimmy Wire Identification sandtrap, not to put you off, but I don't know the answer to your question. But, I do know that if you drop down into the electrical section there is a colored wiring diagram of the entire wiring harness. I will follow along to make sure you get it sharpened out. Please post a follow up, so I can see where you ended up To many whiskies to type __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

01-16-2016, 10:24 AM	#3
hemi43 Registered User Join Date: Mar 2015 Location: Ontario Canada Posts: 1,523	Re: 1972 Gmc Jimmy Wire Identification Purple wire comes from the starter switch (hot on start) then goes to the neutral safety switch at the bottom of column,and then goes to the solenoid on the starter. My guess is that the original wire got damaged because it's near the exhaust, so the previous owner spliced in the new red wire.

01-16-2016, 10:26 AM	#4
Sandtrap9072 Registered User Join Date: Apr 2012 Location: Michigan Posts: 389	Re: 1972 Gmc Jimmy Wire Identification Sweet, thanks guys. What about the green and black wire shown in the second picture?

01-16-2016, 01:11 PM	#6
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 1972 Gmc Jimmy Wire Identification Green wire looks like the temp sender wire. As for the black one, you'll have to trace it back and see where it goes. If it goes into the bulkhead connector, post a pic of where and we can figure it out from there. I would also trace the green one to make sure it goes to the bulkhead too, it's just with that aftermarket wire loom you never know what a previous owner could have put in there. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

01-16-2016, 07:28 PM	#7
87Skier Registered User Join Date: Mar 2014 Location: Corvallis, OR Posts: 715	Re: 1972 Gmc Jimmy Wire Identification Mine had a TCS (transmission controlled spark) module but most of the components were missing. It came out about where you were talking about. I redid my wiring and eliminated this stuff. Look at this link: http://67-72chevytrucks.com/vboard/s...d.php?t=196397 __________________ 1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E

01-18-2016, 01:05 PM	#8
Sandtrap9072 Registered User Join Date: Apr 2012 Location: Michigan Posts: 389	Re: 1972 Gmc Jimmy Wire Identification Thanks for all of your helps fellas, i haven't been able to make it back out into the garage lately. But when i do ill look into the black wire.



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