Location of Trailer Brake Controller Wiring in Engine Compartment of 2013 GMC Sierra
Question:
Hi I cannot find the 2nd trailer break controller wire that is supposed to be wrapped around the harness underneath the master cylinder Ive been looking forever is there anyway my truck did not have that wire or just very hidden its a 2013 gmc sierra 5.3
asked by: Logan
Expert Reply:
The linked article outlines trailer brake controller installation in a 2013 GMC Sierra. The section with the heading "Finalizing Connections for the Brake Controller" includes photos and details about the wiring connections to be made at the power distribution box.
These wires are usually tucked away pretty well and they can be hard to find. Sometimes they are taped to other wiring.
These connections include the wire that delivers 12V operating power for the controller, on the RED wire you'll find under the dash, as well as the 12V auxiliary power connection for the 7-way. These connections are made to studs on the front of the power box as shown in the linked photo.
