Unified Tow Brake testing help
Hi there, first post here. I bought a used Unified braking system, and I'm in too deep to quit now haha. Bought a new vacuum pump, controller from just for towing in Arizona. Everything has been installed. Breakaway works. Green light is on. Manual operation from coach works. Only one red led light comes on when motorhome brakes depressed no matter what the gain knob is dialled to, and the car brakes don't depress. In other words it all works except the proportional braking part haha. Any thoughts?