GMC Savana 2011 Owner's Manual page 263

If holes are made in the body, then
be sure to seal the holes later when
the hitch is removed. If the holes are
not sealed, deadly carbon monoxide
(CO) from the engine's exhaust can
get into the vehicle as well as dirt
and water. See Carbon Monoxide
under Engine Exhaust on
page 9 24.
Safety Chains
Always attach chains between the
vehicle and the trailer. Cross the
safety chains under the tongue
of the trailer to help prevent the
tongue from contacting the road if it
becomes separated from the hitch.
Always leave just enough slack so
the rig can turn. Never allow safety
chains to drag on the ground.
Trailer Brakes
A loaded trailer that weighs more
than 680 kg (1,500 lbs) needs to
have its own brake system that
is adequate for the weight of the
trailer. Be sure to read and follow
the instructions for the trailer brakes
so they are installed, adjusted and
maintained properly.
Trailer Wiring Harness
The optional heavy-duty trailer
wiring package includes a wiring
harness, with a seven-pin connector
at the rear of the vehicle and a
four-wire harness assembly under
the driver side of the instrument
panel. The four-wire harness
assembly comes without a
connector.
If the vehicle does not have a
trailer hitch, the seven-wire harness
assembly with connector is taped
together and located in a frame
pocket at the driver side rear left
corner of the frame.
I n f o r ma t i o n P r o v i d e d b y :
Driving and Operating
If the vehicle has a trailer hitch,
the seven-wire harness assembly
with connector is attached to a
bracket on the hitch platform. In
both cases, the seven-wire harness
has a connector and includes a
30-amp feed wire.
The seven-wire harness connector
contains the following trailer circuits:
Light Green: Back-up Lamps
(10A fuse)**
White: Ground
Dark Blue: Trailer Brake Signal
Dark Green: Right Rear Stop
and Turn Signal*
Red/Black Stripe: Battery Feed
(30A Fuse)
Brown: Trailer Park Lamp
Supply Voltage (15A fuse)**
Yellow: Left Rear Stop and Turn
Signal *
9-55