Wiring harness question redux - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krue · 03-21-2018, 08:34 PM

So, it would appear that the 03 Van computer I have is the Green/blue variety, and I am pretty sure the harness in that 01 parts truck is red/blue. They are both dbc but will they work with each other?

4x4k30 · 03-21-2018, 09:40 PM

Quote:

Originally Posted by krue

So, it would appear that the 03 Van computer I have is the Green/blue variety, and I am pretty sure the harness in that 01 parts truck is red/blue. They are both dbc but will they work with each other?

I asked this ? a few months ago everyone said NO they are not compatiable I forget why but they wont . but you can you use either wiring harness as long as the ecm is for the green blue and the ecm is for the red/blue. its all about the ecm being different .

ls1nova71 · 03-22-2018, 12:15 AM

They're basically the same, but a few 5v reference wires and some grounds are in different spots, but in a swap it wont really matter. The harness wont plug into the older PCM without changing the green connectors with the red ones, or by cutting the tab off of them that keeps them from going in. If you go this route, use the '01 PCM and tune it as an '01 since trying to load newer tunes in older PCM's will sometimes brick them, and you don't want that! LOL!

krue · 03-22-2018, 12:49 AM

I'm wanting to use the 01 harness with the 03 computer, or I guess I can try to fix the few wires that have been butt spliced in to keep the harness and computers matched.

ls1nova71 · 03-22-2018, 02:46 AM

That will work too. The only thing I can think of that's different is the MAF and maybe the O2 sensors, so you may have to swap the plugs for those.

krue · 03-22-2018, 03:20 AM

Quote:

Originally Posted by ls1nova71

That will work too. The only thing I can think of that's different is the MAF and maybe the O2 sensors, so you may have to swap the plugs for those.

I plan on using the 01 truck intake on the 03 Van motor so the MAFsensor will match the harness.
So to sum up:
2001 4.8l truck harness and intake
2003 6.0l van Ecm and engine
This will work?

4x4k30 · 03-22-2018, 05:25 AM

also another thing to consider is the fuel injector connecters I don't know if they are the same on your o1 harness and the 03 harness but I had a 02 complete red/blue wiring harness that I was gona try to use on a 2003-07 engine but the injector connects were different on the blue /green ones .so you can make the harnesses work but they will be a lot of extra wiring to do .

krue · 03-22-2018, 06:26 AM

I figured I would use the injectors that are in the truck intake, still match the harness.

03-21-2018, 08:34 PM	#1
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Wiring harness question redux So, it would appear that the 03 Van computer I have is the Green/blue variety, and I am pretty sure the harness in that 01 parts truck is red/blue. They are both dbc but will they work with each other? __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

03-22-2018, 12:15 AM	#3
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: Wiring harness question redux They're basically the same, but a few 5v reference wires and some grounds are in different spots, but in a swap it wont really matter. The harness wont plug into the older PCM without changing the green connectors with the red ones, or by cutting the tab off of them that keeps them from going in. If you go this route, use the '01 PCM and tune it as an '01 since trying to load newer tunes in older PCM's will sometimes brick them, and you don't want that! LOL! __________________ 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

03-22-2018, 12:49 AM	#4
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Wiring harness question redux I'm wanting to use the 01 harness with the 03 computer, or I guess I can try to fix the few wires that have been butt spliced in to keep the harness and computers matched. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

03-22-2018, 02:46 AM	#5
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: Wiring harness question redux That will work too. The only thing I can think of that's different is the MAF and maybe the O2 sensors, so you may have to swap the plugs for those. __________________ 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

03-22-2018, 05:25 AM	#7
4x4k30 Registered User Join Date: Jun 2003 Location: ga Posts: 630	Re: Wiring harness question redux also another thing to consider is the fuel injector connecters I don't know if they are the same on your o1 harness and the 03 harness but I had a 02 complete red/blue wiring harness that I was gona try to use on a 2003-07 engine but the injector connects were different on the blue /green ones .so you can make the harnesses work but they will be a lot of extra wiring to do . __________________ 4x4k30 if trouble was money i would have plenty

03-22-2018, 06:26 AM	#8
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Wiring harness question redux I figured I would use the injectors that are in the truck intake, still match the harness. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"



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