Where to Find Third Brake Light Circuit for Camper Shell on a 2015 GMC Sierra 2500

Question:

2015 gmc 2500 third brake light wire location for cap?

asked by: Allen

Expert Reply:

There is a dedicated brake light only wire located up under the dash and to the left of the steering column. It is with a wire bundle held together with a white tag. There should be an orange wire that is the center high mount stop lamp wire (CHMSL) that you could use.

You would need to attach wire to the end of it, route it through the firewall, under the truck, and over to where it needs to go.

expert reply by: Jameson C