How to Add a 7-Way and Brake Controller to a 2008 Ford E-450
Updated 01/15/2026 | Published 01/10/2026
Products Featured in This Question
Question:
I have a 2008 E-450 RV. I am trying to find out if this unit has wiring to the rear for electric trailer brakes. It does have trailer lights. The wires are not there for brakes. There are some connectors in the rear wire harness that are unused. I am not able to find an unused connector under the dash that maybe was for a brake controller.
asked by: Sparky B
Expert Reply:
Hey Sparky. If your 2008 Ford E-450 came with a factory 4-way connector, the factory brake controller harness is a brown 6 pin connector located behind the hood release latch up near the firewall inside the cab. There is a gray connector in a similar location that maintains the same pigtail connector however, you are looking for the brown pigtail connector.
For a brake controller, and custom wiring adapter, I recommend the Tekonsha Primus IQ Trailer Brake Controller w/ Custom Harness item # TK38ER. This is one our most reliable and popular brake controllers. It's a proportional controller with the settings easily accessible.
Since your E-450 only has a 4-way connector, you'll also need the Universal Installation Kit for Trailer Brake Controller item # ETBC7. This will provide you with the required 7-way connector that your 4-way will plug directly into. You'll run the blue brake wire and power wire up to the front of your motorhome. The blue wire will connect to the back of the factory harness and the power wire will go to the battery.
What kind of trailer are you pulling? Looks like you're swapping out brakes.
You can add this information, along with any other questions you have, where it says Reply to Jerred H.
(click to enlarge)
Continue Researching
- Search Results: custom fit vehicle wiring
- Shop: Trailer Wiring
- Search Results: accessories and parts
- Search Results: trailer breakaway
- Search Results: curt trailer wiring
- Search Results: dexter trailer brakes
- Shop: Brake Controller
- Search Results: range hood rv vents and fans
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Search Results: clearance lights
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Article: 5 Things to Know About Weight Distribution Hitches
- Article: Brake Controller Installation: Starting from Scratch
- Shop: Miro-Flex LED Clearance or Side Marker Light w/ Chrome Bezel - Submersible - 3 Diodes - Red Lens
- Shop: LED Trailer Clearance or Side Marker Light with Chrome Bezel - 2 Diodes - Red Lens
- Shop: Tire Chains
- Q&A: Difference Between Curt and etrailer Trailer Hitch Receivers for 2020 Chevy Colorado
- Shop: Vehicle Tow Bar Wiring
- Shop: Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector
- Q&A: Installation Of A Brake Controller In A 2008 Ford E450 Camper
- Q&A: How To Install A Brake Controller On A 2008 Ford E-450
- Q&A: Brake Controller Wiring for Ford E-450 Motorhome
- Shop: Trailer Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: How to Choose a Trailer Brake Controller
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: Trailer Wiring Diagrams
on Trailer Brake Controller
Sparky B.
1/12/2026
Yep I found the brown connector under the dash. It was right there this time when I looked. Red, blue, black and a green wire. I also have the same color wires at a connector at the rear. This connector is round with 4-pins. Do you have an adapter for this connector? Vehicle already has the RV 7-prong at the rear so I don’t need that. I’m adding electric brakes to a 6x12 enclosed single axle trailer that I pull behind RVs. I travel in the mountains a bit and would like more braking. And then I will have it if I pull something heavier that has electric brakes. Thanks!