Troubleshooting Trailer Brake Controller that Only Works with Foot Pedal

Question:

I have a 2018 selverado the trailer brakes work when I push the foot pedal but it does not work when I use the manual slide . when I change the gane it makes no difference.What could be the problem ? THANK YOU !!!

asked by: Billy P

Expert Reply:

Do the trailer brakes immediately lock up when you hit the brakes? That would mean you have a short between the trailer brake output circuit and the brake/turn signal circuit of your trailer wiring. Another way to test this would be to turn on both blinkers and see if either causes the brakes to pulse in rhythm with the blinker.

I also attached a help article on troubleshooting brake controller installs for you to check out as well.

expert reply by: Jameson C