Question about 2003 GMC Sierra 2500HD
The controller should have wiring diagrams with it. Also try http://www.etrailer.com/faq-wiring.aspx. The truck should have a harness that plugs into the factory harness under the dash. The harness paperwork will describe where it plugs into and what wires go where along with fuse location. If you don't hav the harness, you can get it from the dealer or the site listed above.
Posted on Feb 11, 2010
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Posted on Jan 02, 2017
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