Is There OEM Brake Controller Wiring for 2023 Ford Transit T350

Published 01/15/2025

Question:

Brake controller and adapter with factory tow package

asked by: Peter N

Expert Reply:

Hey Peter, are you looking for a brake controller with a quick install harness that fits a 2023 Ford Transit T350? If so, we can help with the brake controller but we don't have any custom fit install harnesses for your T350 as it is our understanding the vehicle doesn't have OEM wiring for a brake controller.

You would have to hardwire a brake controller in like our P3 part # 90195.

Does your vehicle have a 7-way at the rear of it? Or do you maybe have a different vehicle?

expert reply by: Jameson C

Peter

1/15/2025

Yes

Jameson C.

1/15/2025

@Peter So I found a forum where someone detailed how to wire in a brake controller to the factory wiring of your T350. Apparently there is a C312 connector under the center console that has brake controller pre-wiring ran to it that you can use. The large blue wire of the harness goes back to the 7-way and should be used for the blue wire of the brake controller, a large yellow/red wire is the 12 volt power and should be ran to the black wire. The white wire of the controller needs be grounded and you can use a ring terminal to ground it to the chassis. For that we have a ring terminal with part # 44-5310A. The red wire of the controller needs to run to a circuit that has 12 volts only when the brakes are applied. You can find this at the brake switch with a circuit tester like part # PTW2993. Look for wires that run to the switch and test them all till you find the one you need. I can't link them here but there in the thread I found there was quite a few pictures and diagrams that you might try Googling to find. I searched "how does brake controller wire to 2023 ford transit t350" and it was first result.