Replacing the 7-Way Trailer Connector on a 2004 GMC Sierra

Published 09/28/2018

Question:

Someone cut and took my towing harness. Need to know the function of each wire with the corresponding color. Thanks

asked by: Mike

Expert Reply:

According to the owner's manual for your 2004 GMC Sierra, the wire functions based on color are as follows:

• Yellow: Left Stop/Turn Signal
• Dark Green: Right Stop/Turn Signal
• Brown: Taillamps
• White: Ground
• Light Green: Back-up Lamps
• Light Blue: CHMSL
• Red: Battery Feed
• Dark Blue: Trailer Brake

In order to replace the trailer connector I recommend using the Hopkins Endurance Multi-Tow part # HM48470 as this will be one of the most cost effective options you have. See video below for install.

expert reply by: Conner L