What are the Wire Colors/Functions on Factory 7-Way Wiring on a 2003 Chevy Silverado 3500

Updated 05/15/2015 | Published 05/14/2015

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Question:

i need to know the what wires do what on the factory pigtail that was coiled up near the gas tank for a in the bed 7 way conector

asked by: Chris

Expert Reply:

On your 2003 Chevy Silverado 3500 with the wire bundle the Yellow Wire is the left turn and brake lights, Dark Green Wire is the right turn and brake lights, Brown Wire is for the taillights, and White is the ground. Often if the loom is cut back, two more wires will be found. The Light Blue wire provides a lead for a camper shell brake light. The other, a Light Green wire, is for the reverse lights.

As far as the brake output wire and the 12-volt circuit I am not sure what color wires they might be. To verify the above functions and find the functions of other wires you will need to use a circuit tester such as # PTW2993 to test the wires and determine function.

expert reply by: Michael H