Wiring Harness for 2004 Ford F-250 With Cequent Brake Controller

Updated 03/25/2026 | Published 03/20/2026

Products Featured in This Question

Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In

(280)

$14.94

Curt Wiring Adapter for Tekonsha Brake Controller

(10)

$12.43

Question:

i have a 2004 f-250 XL 5.4. is this the adapter/cable i need? adding under dash photos and of my controller. i think its Part Number: C51322

asked by: Ben J

Cequent Brake Controller
(click to enlarge)

Expert Reply:

Hey Ben! The Curt Custom Wiring Adapter for Trailer Brake Controllers # C51322 will fit your 2004 F-250. However, this is designed to fit Curt brake controllers. You will also need the Curt Wiring Adapter for Tekonsha Brake Controller # C68VV to complete the setup.

What will you be towing with your F-250?

expert reply by: Robin H

Curt Wiring Adapter
(click to enlarge)

Ben J.

3/24/2026

A 16' twin axle flatbed trailer with a ford 8N tractor. Trailer weight is 1900lb and tractor is 2400lb.

Robin H.

3/25/2026

@BenJ that’s a solid load, definitely worth having the controller set up. Those adapters will give you a simple plug-and-play install under the dash, just dial in the gain once it’s installed.

Ben

3/25/2026

@RobinH My trailer brake controller is a Tekonsha Primus IQ Proportional brake controller. If the adapters you recommended are correct, is this the best brake controller for my application? Im in Western WA, so hills are abundant.

Robin H.

3/25/2026

@Ben it isn't the absolute best on the market but it is reliable and will work well. If you had a time-delayed controller I would say replace it but the Primus IQ is proportional so you're set. The adapters will work with that brake controller.