Chevrolet 2009 TrailBlazer Owner's Manual page 305

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 towing a light-duty trailer with a standard four-way
round pin connector, an adapter connector is available
from your dealer/retailer.
If charging a remote (non-vehicle) battery, turn on the
headlamps to boost the vehicle system voltage and
properly charge the battery.
The vehicle is also equipped with wiring for an electric
trailer brake controller. These wires are located inside the
vehicle on the driver side under the instrument panel.
These wires should be connected to an electric trailer
brake controller by your dealer/retailer or a qualified
service center.
The vehicle may be equipped with a four-pin trailer
towing harness. This harness has a four-pin trailer
connector that contains the following trailer circuits:
•
Yellow: Left Stop/Turn Signal
•
Dark Green: Right Stop/Turn Signal
•
Brown: Running Lamps
•
White: Ground
This harness also contains the following trailer circuits
that are not connected to the four-pin trailer connector:
•
Light Green: Back-Up Lamps
•
Dark Blue: Electric Brakes
•
Red: Battery Feed
If the vehicle is a TrailBlazer SS, a trailer wiring harness
extension, and instructions for installing this extension,
were provided when the vehicle was delivered. This
extension will allow the vehicle's trailer wiring harness to
be more easily accessible. There is a four-way connector
on the harness. A seven-way adapter plug is also
included if the trailer requires it.
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