Why Doesn't Brake Controller Voltage When Tested Parked Ramp Up Higher than Manual Override

Question:

I replaced my horse trailer hubs and brak assy Got parts from etrailer When depressing my break petal on my 2021 F350. I only get one bar on gain out put. When depressing brk controller manualy ,I can controll higher there ??? Before replacing trailer breaks worked perfect. At a 5 to 6 gain setting. Only after installing am I having issues. I did adjust breaks as recommended on etrailer video and tech help. What am I missing ??? Thank You

asked by: Jamie M

Expert Reply:

Your truck has a proportional brake controller that needs to sense a change in inertia for the braking output to really ramp up. So what you are seeing is normal since you are testing the output when vehicle is parked.

expert reply by: Jameson C