backformore
New member
I'm trying to install a brake controller in my 99 Burb. Does anyone who has done this have a suggestion on how to access the brake switch or where to pass the other wires through the firewall?
GMC was kind enough to run the external wiring (which would have been easy to do) but has none of the internal.
Help
GMC was kind enough to run the external wiring (which would have been easy to do) but has none of the internal.
Help