Please help, 04 GMC Sierra 1500

[Tyler Porter]

Hello Everyone,

 

I'm helping a friend with his truck, 2004 GMC Sierra 1500 SLE 5.3L. Removed and replaced forgive me if the name is incorrect the I/P Harness that runs from the Fuse Block under the hood ,through the firewall, and  runs along the dash. Got it out with a struggle, install went smooth until the reason I'm asking for help. I have a connector that I can not figure out where it belongs???  It's a grey with  8 cavities with 1 Black with White stripe (Ground), 1 Brown, and 2 Brown with White Stripe wires. It exits the harness where the headlight dimming switch connector does. If anyone can help me or if you need more information please let me know. Thank you in advance for your time.

[Sharpz]

checking

Edited April 28, 2021 by Sharpz
wrong color code

[redvett]

Wild guess but maybe the brake light switch. Why did you replace the harness.

[Sharpz]

So I did look to see if I could locate that harness connection and just cant seem to find it on my 04 gmc sierra. I do know, that black w/ white tracer can be linked to the multifunction switch, brakes, Hvac, and RAF.  I am assuming you removed the old harness because the truck caught fire, or had serious damage.  How sure are you that you got the exact same harness from a sierra 04?  I can give you a link to every wiring diagram for your truck, but there is a lot of information, and it will take time to work through.  There is a limited amount of spots this connection can go, have you put juice to the truck yet to see if it would crank/code?  

[Coupe4888]

On 4/28/2021 at 12:43 AM, Tyler Porter said:

Hello Everyone,

 

I'm helping a friend with his truck, 2004 GMC Sierra 1500 SLE 5.3L. Removed and replaced forgive me if the name is incorrect the I/P Harness that runs from the Fuse Block under the hood ,through the firewall, and  runs along the dash. Got it out with a struggle, install went smooth until the reason I'm asking for help. I have a connector that I can not figure out where it belongs???  It's a grey with  8 cavities with 1 Black with White stripe (Ground), 1 Brown, and 2 Brown with White Stripe wires. It exits the harness where the headlight dimming switch connector does. If anyone can help me or if you need more information please let me know. Thank you in advance for your time.

Does it go to a rear cargo lamp button I have an 04 chevy and there is a plug with the headlight switch that goes to a push button right next to the head light switch that runs the cargo lamp and I do rember the plug looked the same as that one I would have to pop the button back out to see If the colors are the same but If I rember correctly they are