GMC 2003 Sierra - Manual (Page 371)

The eigiht-wpre harness contains Che following trailer
circuits^
Vellow: Left Stop/Turn Signal
Darit Graenr Right Slop/Tum Signal
Brown: Taiiiamps
While; Ground
Llghl Green: Back-up Lamps
Light Blue; CHMSL
Bed; Battery Feed
Dark Biue Trailer Brake
It your trailer is equipped wilh eleciric brakes, you can
get a Jumper harness {electric trailer brake control)
with в trailer baltery feed fuse from your deafer.
(f you need to tow a light-duty trailer wilh a standard
tour-way round pm connector you can also get an
adapter from your dealer.
Camper/Fifth-Wheei Trailer Wiring Package
The elghl-wire camper harness is located under ihe
front edge oi the pickup box on Ihe drlver^B side of the
vahicle, attached to Ihe frame brackel A connector
will have to he added lo the wiring harness whicin
connects lo Ihe camper.
The Bight-wire harness conlalns the following
camper/trailer
CirCuilSI
VeNow; Left Stop/Tum Signal
Dark Green: Right Stoprrum Signal
Brown: Taillarmps
White: Ground
Light Green: Batk-up Lamps
Light Blue: Center High-Mounted Stoplamp
(CHMSL)
fled; Battery Feed
Dark Blue: Trailer Brake
A [umper harness for an eJecthc trailer brake controller
and a trailer battery feed Fuse are included with ihis
Irailonng package. (See fnsfrumeat Panel Jumper
W iring
Harness later in thia section.)
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