GMC 2001 Sierra 1500 Pickup Owner's Manual page 302

If your vehicle is equipped with the "Heavy
Trailering" option, please refer to "Heavy
Wiring Package", earlier in this section.
-
When the camper wiring harness is ordered without the
-
heavy duty trailering package, an eight
-
with a seven pin connector and separate CHMSL
connector are located at the rear of the vehicle and are
tied to the vehicle's frame.
4-80
Instrument Panel Jumper Wiring Harness
-
Duty
-
Duty Trailer
This harness is included with the heavy
camper/fifth
is for an electric trailer brake controller and includes a
-
wire harness
trailer battery feed fuse. This harness and fuse should be
installed by your dealer or a qualified service center.
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wheel trailer wiring packages. The harness
-
duty and