No Brake or Turn Signals With Trailer Wiring Harness On a 2007 GMC Acadia
Updated 10/01/2019 | Published 09/29/2019
Question:
2007gmc Acadia I plugged in to the factory harness and all that works is tail light no brake light no turn signals I put the the same releys as the others 8373 denso
asked by: Marty M
Expert Reply:
I am not sure which exact trailer wiring harness you are using but if you have one that plugs into the factory tow package plug like the T-One Vehicle Wiring Harness part # 118384 for example then the issue you are having would lead me to believe that you are missing some fuses/relays or they are blown. I took a look in your owner's manual and it lists two fuses for the stop/turn signal lights, "LT TRLR STOP/TRN" for the left stop/turn circuits and "RT TRLR STOP/TRN" for the right stop/turn circuits. There are also two relays as well, "LT TRLR STOP/TRN" for the for the left stop/turn circuits and "RT TRLR STOP/TRN" for the right stop/turn circuits. Please make sure you have the relays oriented correctly and you don't hear any clicking sounds as that would indicate they are bad
These fuse and relays are all located in the engine bay fuse box.
