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Discussion Starter #1
[ame]http://www.amazon.com/METRA-70-2054-Harness-PONTIAC-BYPASS/dp/B00FMSCLOS/ref=sr_1_1?ie=UTF8&qid=1401291311&sr=8-1&keywords=OLDS+PONTIAC+98-04+AMP+BYPASS[/ame]

is this the right wiring harness i have found a few different plugs i thought i would ask hoping some one has done this before?

2004 gmc 2500hd

thanks!
 

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No. Metra 70-2003 is the right one....well sort of. You have to run a acc wire off the fuse box to the red wire on the radio. You will lose your door chimes and on star. But to most that's not that big of a deal

The right one is metra gmos-01 if non Bose, or gmos-04 if Bose, or the PAC equivlient. I don't know the PAC # because I delt with metra, but the PAC unit is better
 

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I pulled the factory stereo out today and there is another pull that's black the harness that you recommend only has one plug what is the little black plug for?
 

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It's been awhile, but I wanna say it's for the onstar. The 04 I just did, had Bose, but no onstar, and it didn't have the 2nd plug. I used the 70-2003 on it, along with a aswc for the steering wheel controls
 

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Ok I don't have OnStar but knowing that the 70-2003 works makes me feel better I also bought the aswc was it easy to install?
 

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Yeah. Ran a red wire to the fuse box on the drivers side for acc power. I used a small pick, and depinned the dimmer wire out of the 2003 harness, and moved it to the a1 spot. Hooked that to the white/green wire off the swc harness. Wired up everything color for color, turned the truck on, held the volume up button on the wheel, and it was done
 
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