Trailer Wiring Harness
Heavy-Duty Trailer Wiring Package
Your vehicle is equipped with a trailer towing
harness. This harness with a seven-pin universal
heavy-duty trailer connector is attached to a
bracket on the hitch platform.
The trailer towing harness contains the following
trailer circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Taillamps
White: Ground
Light Green: Back-up Lamps
Light Blue: Center High-Mounted Stoplamp
(CHMSL)
Red: Battery Feed
Dark Blue: Trailer Brake
A jumper harness for an electric trailer brake
controller and a trailer battery feed fuse may be
included with this trailering package. See
“Instrument Panel Jumper Wiring Harness” later in
this section.
If you need to tow a light-duty trailer with a
standard four-way, round pin connector, an
adapter may be included. See “Four-Wire Harness
Adapter” later in this section.
Instrument Panel Jumper Wiring Harness
Notice:If your vehicle has factory or
dealer-installed HUMMER off-road lamps, the
place where an electric trailer brake connection
must be made is already in use. Do not attempt
to double-up or “piggyback” the connection,
because this could cause a failure or damage to
your vehicle, the electric trailer brake system,
or both. If you want to connect a trailer with
electric brakes to your vehicle, see your dealer
to disconnect the off-road lamps. Also, read
Add-On Electrical Equipment on page 503for
more information.
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