GMC 2001 Sierra 1500 Pickup Owner's Manual page 300

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The six wire harness contains the following
trailer circuits:
D
Yellow: Left Stop/Turn Signal
D
Dark Green: Right Stop/Turn Signal
D
Brown: Taillamps
D
White: Ground
D
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Light Green: Back up Lamps
D
Light Blue: Center High
Stoplamp (CHMSL)
If you need to upgrade your vehicle to heavy
trailering, a brake controller harness and an underbody
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harness with a seven pin universal heavy
connector are available from your dealer.
4-78
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Mounted
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duty
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duty trailer
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Heavy Duty Trailer Wiring Package (If Equipped)
Your pickup may be equipped with the eight
towing harness. This harness with a seven
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heavy duty trailer connector is attached to a bracket on
the platform hitch.*
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* The Center High Mounted Stoplamp (CHMSL) wire
is tied next to the trailer wiring harness for use with a
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trailer, slide in camper or cap.
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wire trailer
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pin universal