Forum Discussion

TNGW1500SE's avatar
TNGW1500SE
Explorer
Mar 18, 2022

Trailer Brakes

I have a 2020 transit 250. I just installed a set of new trailer electric brakes on my 12x6 cargo trailer. Somewhere around 2K pounds. I got them off Amazon. The brand is Southwest Wheel 3,500 lbs. Trailer Axle Electric Brake Kit. It's a magnetic drum kit.

I also installed a Tekonsha 90195 P3 Electronic Brake Controller. I hooked the controller up to the CCP connector and grounded it between the seats at the factory ground. Got a brake signal off the connector at the brake pedal using the far left connector. Ran a wire all the way back to the new 7 pin connector.

It works but barely. You can feel the brakes a little bit if you move the lever when the controller is set on 14 (Max) with the boost set to 3 (high). If I pull the lever all the way the controller reads up to 13.5. It does apply power to the brakes (like it should) when I apply the vans brakes as well. I adjusted the brakes before I drove it the first time and then again after driving. I turned the adjuster until the wheel wouldn't turn and backed it off a few clicks just until it had a very little drag. Set on 14 with the boost on 3 it will barely kick in the brakes and will not lock up even in gravel. Everything is new.

UPDATE: Measured voltage at the trailer. 10.43 volts when the lever is pulled to max
  • Guessing ground wire and the run to the trailer via sheetmetal to receiver, to shank, to ball, to trailer coupler, to trailer frame, to axle (via leaf spring mounting hardware), to the backing plate and finally to the magnet

    You may have full voltage, but with that path, it will NOT carry much or enough current

    If that is the case, then run a dedicated ground wire directly from the controller to the trailer brake magnet wire. Of course some connectors, but chose low impedance connectors.

    Also, use a large gauge wire

About RV Tips & Tricks

Looking for advice before your next adventure? Look no further.25,111 PostsLatest Activity: Feb 19, 2025