GMC 2003 C4C042 Owner's Manual page 141

Certain electrical accessories may not be compatible
with the accessory power outlet and could result in
blown vehicle or adapter fuses. If you experience a
problem, see your dealer for additional information on
accessory power outlets.
NOTICE:
Adding some electrical equipment to your vehicle
can damage it or keep other things from working
as they should. This wouldn't be covered by your
warranty. Check with your dealer before adding
electrical equipment, and never use anything that
exceeds the amperage rating.
When adding electrical equipment, be sure to follow the
proper installation instructions included with the equipment.
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NOTICE:
Power outlets are designed for accessory plugs
only. Do not hang any type of accessory or
accessory bracket from the plug. Improper use of
the power outlet can cause damage not covered
by your warranty.
Trailer Connections (C4/C5 Models
Only) (If Equipped)
Heavy-Duty Trailer Wiring Package
Your vehicle may be equipped with an eight
towing harness. This harness, with a seven
-
heavy duty trailer connector, is attached to a bracket on
the platform hitch.
-
The Center High Mounted Stoplamp (CHMSL) wire is
tied next to the trailer wiring harness for use with a trailer.
-
wire trailer
-
pin universal