GMC 2008 Savana Van Owner's Manual page 240

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 *
4-42
The four-wire harness (without connector) contains the
following circuits:
•
Black: Ground
•
Red/White: Battery Feed
•
Dark Blue: Trailer Brake Signal
•
Light Blue: CHMSL/Stoplamp Supply Voltage
* If your vehicle is a cutaway with trailer provisions,
a 15 amp fuse will be shared for both left/stop trailer
turn and right/stop trailer turn signals. However,
the cutaway lighting connector will have a 10 amp
fuse for each signal.
** If your vehicle is a cutaway with trailer provisions,
a 15 amp fuse will be shared for trailer park lamps and
cutaway rear lighting connector park lamps. Also, a
10 amp fuse will be shared for trailer back-up lamps
and cutaway rear lighting connector back-up lamps.