How to Activate Trailer 12V Circuit on 7-Way on 2014 GMC Yukon XL

Updated 06/26/2017 | Published 06/24/2017

Question:

I have 2014 gmc yukon. I have connected red wire from bundle and the 40 amp fuse was already in block.. Still no power to the rear of vehicle 1 oclock tab. Help me please

asked by: Brian

Expert Reply:

On your 2014 GMC Yukon XL there are two wires under the hood that have to be connected to make the tow package functional, one is the power wire to the brake control and the other is the battery charge line to the 7 way connector. This is the wire that feeds the 7-way circuit on the pin at the 1-o-clock position as you view the socket.

These wires are both Red/Black with eyelets on them. They are coiled up under the hood and will need to be connected to the under hood fuse box. One of the wires is located between the under hood fuse box and the left (driver) side fender. The other is located under the master cylinder/brake booster assembly.

The battery charge wire and the power wire to the brake control have different size eyelets on them and will connect to the threaded studs under the Gray handle at the front of the fuse box. The two studs are also different size. Please refer to the linked article which includes a photo of the two studs.

expert reply by: Adam R