Trailer Wiring Harness for a 2003 Ford Crown Victoria

Updated 10/07/2024 | Published 09/16/2015

Products Featured in This Question

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

(45)

$31.44

Hook Probe Circuit Tester

(65)

$12.94

Question:

Need part number for trailer wiring harness.

asked by: Mike M

Expert Reply:

For your 2003 Ford Crown Victoria you can use Hopkins trailer wiring harness # 46255. There isn't a T-connector that just plugs into the taillight wiring available for your vehicle so you will need to use this hardwire harness.

You will also need a circuit tester such as # PTW2993 to test the vehicle tail light wiring. On the harness yellow is left turn signal, green is right turn signal, red is brake lights, brown is running lights, and white is ground.

The other red wire with the butt connector attaches to the long red wire. This wire will get connected to the positive battery terminal via the included fuse holder and fuse. This is what powers the trailer lights.

expert reply by: Michael H

Don

10/6/2024

I'm 90% of the way done on my installation of this unit on my 2009 Crown Victoria Police Interceptor. I'm down to the red wire and the brown wire coming from the controller. The two turn signal wires are hooked into the car's harness. When the taillights are turned on, the two black wires in the car's taillight harness have power but when the brakes are applied, neither of these two wires has power. What am I missing?

Robin H.

10/7/2024

@Don I'm sorry but we don't know what the wire colors will be on your 2009 Crown Vic so you're going to have to continue to use a tester to identify the brake light circuit and tail light circuit. It sounds like those aren't the correct wires so you will need to test until you find them and connect the tail light to the brown and brake light to the red.