Trailer wiring harness package – GMC 2003 Sierra User Manual
Page 370
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The £ij(-wl№ harness contains the following irailer
ciicuils;
* yelJoirti: Lefi Slop/Torn Signal
• Dark Green’ RighI Slop/Tum Signal
* Bfovvn Taillamjps
• Whits: Ground
♦ Light Green: Back-up Lamps
• Light Blue: Center High-Mounted Sloplamp
(CHMSL)
If you need to upgrade your traslor wiring harness, an
additional 2-wire harness and 7 pin universal trailer
connector are availa'b'lg from your dsatgr.
Trailer Wiring Harness Package
Your pickup may be equipped with the eight-wire frailer
towing harness. This harness with a seven-pin
universal Irailer connector Is attached to a bracket on
the hitch plalfotm.*
* The Center High-Mounied Stoplamp [CHMSLJ wire is
tisd next to the tmller wiring harness lor use with a
trailer, slide-in camper or cap.
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