Trailer Wiring and Brake Controller Set up For a 2003 Ford Van E350

Updated 06/11/2026 | Published 06/10/2026

Products Featured in This Question

Redarc Tow-Pro Liberty Brake Controller w/ Custom Harness - Dash Knob - Up to 2 Axles - Proportional

(2933)

$217.00

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(25)

$41.50

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3496)

$118.67

Question:

Good morning I am trying to upfit my 2003 E350 super duty with a trailer braking system. I want a complete kit with the wiring harness including pigtail and controller. Do you offer something like that? or can you send me something that will work. Thanks.

asked by: Brandon M

Expert Reply:

Thanks for your question, Brandon.

We have everything you need. There are two different options depending on what wiring is already on your van.

The first option is if your van already has a 4-flat connector at the rear. If it does, you would need the Universal Installation Kit # ETBC7 to upgrade from a 4-flat to a 7-way. For a brake controller, the easiest option to install would be the Redarc # RED96CR.

If your van does not have any wiring at the rear bumper, then you'll need a few different parts. You would want to pick up the Curt T-Connector # C55344, the Universal Installation Kit # ETBC7, and then the Redarc Tow-Pro Liberty # RED62NR.

The Redarc is a really great controller because it doesn't take up any knee space like a traditional brake controller. It's also incredibly reliable and will automatically calibrate itself once installed. From there, you can fine-tune the settings to your preference using the control knob, which can be mounted almost anywhere in the cab.

I've included a picture below showing what the knob looks like once installed.

What kind of trailer are you planning to tow?

expert reply by: Gwendolyn Y

Redarc Knob Installed
(click to enlarge)

Don F.

6/11/2026

I installed one in a 2020 Ford Explorer and it was a very simple procedure as my vehicle had both 4 pin and 7 pin plug ins. I find the actual control knob out of the way and extremely easy to use

D H.

6/11/2026

If they offer the Red Arc Pro Liberty for your vehicle, I can say it worked wonderfully on my 509WHP 2021 Explorer ST. It was very easy and clean to install and quick to calibrate with my camper.