Hummer 2007 H3 Owner's Manual page 307

Maintenance When Trailer Towing
Your vehicle will need service more often when
you're pulling a trailer. See the Maintenance
Schedule for more on this. Things that are
especially important in trailer operation are
automatic transmission fluid, engine oil, axle
lubricant, belts, cooling system and brake
system. Each of these is covered in this manual,
and the Index will help you find them quickly.
If you're trailering, it's a good idea to review
these sections before you start your trip.
Check periodically to see that all hitch nuts
and bolts are tight.
Trailer Wiring Harness
Light-Duty Trailer Wiring Package
If your vehicle is not equipped with a trailer
towing package, the chassis harness will
contain the following blunt cut circuits:
•
Yellow: Left Stop/Turn Signal
•
Dark Green: Right Stop/Turn Signal
•
White: Ground
•
Brown: Tail Lamps
If you want to add on a trailer tow, it should be
installed by your dealer or a qualified service
center. Also, see Add-On Electrical Equipment
on page 416 for more information.
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