2003 Wiring Harness

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=9165
Printed Date: August 20, 2025 at 12:58 PM

Topic: 2003 Wiring Harness

Posted By: muscleshop
Subject: 2003 Wiring Harness
Date Posted: February 06, 2003 at 11:23 PM

Anyone know WHEN a wiring harness for a 2003 Silverado will be available?? Trying to put my Alpine head unit in the new truck, since the factory radio stinks! Nobody in the Hoston area has them yet (at least nobody I have talked to...lol)

Thanks

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"If muscles were chocolate, I'd be Willy Wonka"

Replies:

Posted By: bberman1
Date Posted: February 07, 2003 at 10:26 AM

might want to contact PAC https://www.go2pac.com or Metra https://www.metraonline.com

Posted By: Chris Luongo
Date Posted: February 08, 2003 at 8:05 AM

What stinks about the factory radio? Delco radios are among the best. It'd take a lot to get me to downgrade to aftermarket, unless the factory unit had no CD player.

The wiring harness houldn't be any different from a harness for a 2000+ Cavalier, or a newer Saturn harness. If you use a Saturn harness, the wire colors will be incorrect, but your truck still uses standard GM wire colors, so it'll be easy to figure out.

Also, there is no switched power at the radio, as the on/off gets controlled by GM's databus. Remove the driver's underdash, located (and test) the large brown wire behind the fuse box; this is accessory power. Attach a 10-amp fuse, and run a length of wire up to the radio.