Chevrolet 2007 TrailBlazer Owner's Manua page 381

Trailer Wiring Harness
Your vehicle may have a seven-wire trailer towing
harness. This harness may have a seven-pin
universal heavy-duty trailer connector (if equipped
with the trailering package) that is attached to a
bracket on the hitch platform or included with the
four-pin trailer towing harness. If your vehicle is
not equipped with the heavy-duty trailer connector,
you may purchase one from your dealer.
The seven-wire harness contains the following
trailer circuits:
•
Yellow: Left Stop/Turn Signal
•
Dark Green: Right Stop/Turn Signal
•
Brown: Running Lamps
•
White: Ground
•
Light Green: Back-up Lamps
•
Dark Blue: Electric Brakes
•
Red: Battery Feed (The chassis wiring ring
terminal must be fastened to a stud on the
underhood electrical center before the trailer
feed will become active.)
If you need to tow a light-duty trailer with a
standard four-way round pin connector, an adapter
connector is available from your dealer.
If you are charging a remote (non-vehicle) battery,
turn on the headlamps to boost the vehicle
system voltage and properly charge the battery.
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