Chevrolet 2002 Tahoe Owner's Manual page 282

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The seven wire harness contains the following
trailer circuits:
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Yellow: Left Stop/Turn Signal
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Dark Green: Right Stop/Turn Signal
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Brown: Taillamps
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White: Ground
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Light Green: Back up Lamps
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Red: Battery Feed
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Dark Blue: Trailer Brake
A jumper harness for an electric trailer brake controller
and a trailer battery feed fuse are included with this
trailering package. (See "Instrument Panel Jumper
Wiring Harness" later in this section.)
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If you need to tow a light
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four way round pin connector, an adapter connector is
included with your vehicle.
duty trailer with a standard
Instrument Panel Jumper Wiring Harness
This harness is included with the heavy
wiring package. The harness is for an electric trailer
brake controller and includes a trailer battery feed fuse.
This harness and fuse should be installed by your dealer
or a qualified service center.
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duty trailer
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