Hummer 2006 H3 - 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
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.
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