2003 Sierra 2500HD 8.1 Cruise control wires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**pound41** · 11-14-2020, 06:44 PM

Hello I have a GMC 2500HD 8.1L Goes into reduced engine power.
Everything has been replaced with new GM still does it. So I am getting a harness made. I need to know where the cruise control wires coming off the TAC module go so i can measure the length. I know they eventually go to the column but I dont see any wires coming off the TAC module and going directly back into the firewall.
Any help is greatly appreciated
Thanks

Andy4639 · 11-15-2020, 06:24 PM

Quote:

Originally Posted by pound41

Hello I have a GMC 2500HD 8.1L Goes into reduced engine power.
Everything has been replaced with new GM still does it. So I am getting a harness made. I need to know where the cruise control wires coming off the TAC module go so i can measure the length. I know they eventually go to the column but I dont see any wires coming off the TAC module and going directly back into the firewall.
Any help is greatly appreciated
Thanks

Need more info. Year model what ECU you using?

**pound41** · 11-15-2020, 08:26 PM

2003 GMC sierra 8.1L everything is factory stock/OEM

Andy4639 · 11-15-2020, 08:48 PM

See if these help.

http://67-72chevytrucks.com/vboard/s...d.php?t=375577

https://www.lt1swap.com/8100_harness.htm

https://www.lt1swap.com/pictures/fig_16.gif

**pound41** · 11-15-2020, 09:00 PM

I have looked at those but I am not smart enough to figure those out.There are 4 wires for the cruise control in the 16 pin harness for the throttle body etc
What is the path they take. I know the wires eventually go to the column. I don't see any of the wires in the harness going directly back into the firewall.
The harness goes down under the fuse box under the hood then a few wires go to the ecm 8 wires go on to the throttle body. Theres a few grounds but I have no idea where the CC wires go. I need to measure and give the company lengths of the wires for them to build the new harness

Andy4639 · 11-15-2020, 09:49 PM

Try and message
ls1nova71 he got me mine for cable cruise. He knows his stuff on the wiring for the LS swaps. He even drew me a simple wiring diagram for me to follow.
You might post this over in the LS swap area. Those guys have done it all.

11-14-2020, 06:44 PM	#1
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,267	2003 Sierra 2500HD 8.1 Cruise control wires Hello I have a GMC 2500HD 8.1L Goes into reduced engine power. Everything has been replaced with new GM still does it. So I am getting a harness made. I need to know where the cruise control wires coming off the TAC module go so i can measure the length. I know they eventually go to the column but I dont see any wires coming off the TAC module and going directly back into the firewall. Any help is greatly appreciated Thanks

11-15-2020, 08:26 PM	#3
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,267	Re: 2003 Sierra 2500HD 8.1 Cruise control wires 2003 GMC sierra 8.1L everything is factory stock/OEM

11-15-2020, 08:48 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: 2003 Sierra 2500HD 8.1 Cruise control wires See if these help. http://67-72chevytrucks.com/vboard/s...d.php?t=375577 https://www.lt1swap.com/8100_harness.htm https://www.lt1swap.com/pictures/fig_16.gif __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-15-2020, 09:00 PM	#5
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,267	Re: 2003 Sierra 2500HD 8.1 Cruise control wires I have looked at those but I am not smart enough to figure those out.There are 4 wires for the cruise control in the 16 pin harness for the throttle body etc What is the path they take. I know the wires eventually go to the column. I don't see any of the wires in the harness going directly back into the firewall. The harness goes down under the fuse box under the hood then a few wires go to the ecm 8 wires go on to the throttle body. Theres a few grounds but I have no idea where the CC wires go. I need to measure and give the company lengths of the wires for them to build the new harness

11-15-2020, 09:49 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: 2003 Sierra 2500HD 8.1 Cruise control wires Try and message ls1nova71 he got me mine for cable cruise. He knows his stuff on the wiring for the LS swaps. He even drew me a simple wiring diagram for me to follow. You might post this over in the LS swap area. Those guys have done it all. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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