Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
This item does not fit your vehicle
2001 Lincoln Navigator
These items fit your vehicle
2001 Lincoln Navigator
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Wiring a trailer can be tricky when you have to splice into factory wires, but this Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector skips all that. It plugs directly into your vehicle’s tail light wiring for a simple, plug-and-play connection. There’s no guesswork or cutting, just solid connectors that snap in place and work right away.
This harness uses a powered converter that pulls power directly from the battery instead of the vehicle’s light circuits. That means the trailer lights get full, reliable power while your vehicle’s wiring stays protected from overloads or shorts. It’s the right setup for safe, consistent lighting every time you tow.
A solid ground connection to bare metal ensures the system works smoothly without flickering or weak signals. The fused power line with a 10-amp fuse and 12-gauge wire protects the circuit from shorts or excessive current draw, keeping both the harness and vehicle safe for the long haul.
Once installed, the 4-flat connector gives you running lights, turn signals, and brake lights for your trailer. It’s built to handle small utility trailers, campers, or boat trailers—everything you need for towing with confidence and visibility on the road.
The wiring harness will not function properly without connecting the included black power wire directly to the vehicle’s positive battery terminal. Do not connect to any other power source. Use only a 10-amp fuse inline. If fuse continues to blow, inspect all wiring for shorts or damaged insulation before replacing the harness.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Heather A.
5/5/2025
Hi Matt, thank you for the picture. The plug that you will need to plug into is behind the taillight not on the taillight itself. You are plugging into the black plug that you disconnected that gray plug from. Let me know if you need anymore help.
Victoria H.
3/20/2025
Thanks for taking the time to share your insight Rick! It’s always a bit of a gamble when it comes to water exposure, but the mounting location you chose shouldn't be an issue. This install can be tedious but you got it done, and it sounds like its working fine and is ready for a trip. Keep up posted on how this works long term!
Jack C.
5/24/2015
Hi Bob, I would also like to run my flat four connector through the jack storage area on my 2014 town and country but am having trouble routing it. I see the grommet you are talking about and have removed it just to see how I can route the connector. After removing the grommet how do you get into the jack storage ares without doing some cutting?
Dick B.
11/8/2015
works great have experienced no problems
Jim C.
8/5/2015
The first C56150 wiring harness failed within a year see 06/25/2015 review. Per etrailer.coms instructions I returned the wiring harness and was sent a replacement. My voltmeter indicates that the new harness is working correctly.
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Lance
5/10/2021
Its working exactly like it should. And really, when you buy a custom hitch made for your vehicle and follow up with a few welds there really is nothing to go wrong. If I get another vehicle and need another hitch I wont hesitate to get it here and I wont have to spend the usual two hours researching the market first.