Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2003 Ford Excursion
These items fit your vehicle
2003 Ford Excursion
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This harness ties right into the existing junction box in the cargo area, using the same factory location designed for trailer wiring. There’s no need to cut or splice a single wire. You just plug the connectors in, and everything fits together solidly behind the trim for a clean install that looks like it came that way from the start.
The built-in powered converter takes the load off your factory wiring and shields the vehicle’s electronics. It uses Curt’s newer circuit board design that sheds less heat and lasts longer than older styles. That means your lighting signals stay consistent and your vehicle wiring stays safe, even when towing frequently.
With a standard 4-flat connector, this harness gives you running lights, turn signals, and brake lights—everything needed for most small and mid-size trailers. It’s simple, universal on the trailer side, and easy to test with a basic circuit tester before hooking up.
Each connector seats firmly in place to keep out dirt and moisture. The ground wire mounts to clean bare metal for a solid connection that helps prevent flickering or intermittent signals down the road. Once installed, it’s dependable trip after trip with no extra maintenance needed beyond basic checks before towing.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Scott R.
10/20/2014
Still works like it should. In fact I just moved from Fort Hood to Las Vegas and pulled my bike trailer with no issues in the wiring or signaling. I appreciate the follow-up.
Jim L.
5/11/2021
Still working great
Jeff P.
5/3/2015
Still the easiest and cheapest way to get a wiring harness on my Odessey.
Tom G.
7/17/2018
All is well, your products have never disappointed!
Omar A.
6/30/2019
Still working well!
Ken
4/7/2019
Works flawlessly every time I have used it since.
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Neil
1/5/2026
Still, after a year, whenever we use the trailer we know the lights will work. If there’s a problem it’s with the trailer lites. Great pirchase!