Hummer 2006 H3 Owner's Manual page 270

Heavy-Duty Trailer Wiring Package
If your vehicle is equipped with a trailer towing package,
the rear bumper harness will have a seven-pin
universal heavy-duty trailer connector attached to a
bracket on the hitch platform.
The trailer towing harness contains the following
seven trailer circuits:
•
Yellow: Left Stop/Turn Signal
•
Dark Green: Right Stop/Turn Signal
•
Brown: Taillamps
•
White: Ground
•
Light Green: Back-up Lamps
•
Red: Battery Feed
•
Dark Blue: Trailer Brake
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Four-Wire Harness Adapter
If you need to tow a light-duty trailer with a standard
four-way, flat pin connector, an adapter is available from
your dealer.
Use this adapter to
connect a standard
four-way pin connector to
the seven-wire harness
on your vehicle.