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Hooking up trailer lights doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector uses factory-style plugs that fit right into the rear light housings. Each connector snaps in with a solid click so you know it’s fully seated. It’s a plug-and-play setup that gets you towing faster with no guesswork about which wire goes where.
This harness comes with a powered converter that connects straight to the vehicle battery. That power line isolates the trailer lighting circuits from the vehicle lights, so the trailer lights draw their own power instead of loading the vehicle wiring. The built-in fuse adds circuit protection, and in case of a short on the trailer, only the converter or fuse would blow—not the vehicle electronics. It’s simple peace of mind every time you tow.
The 4-flat connector gives your trailer running lights, turn signals, and brake lights through standard pins that match most small and midsize trailers. It’s a clean, weather-resistant plug that tucks neatly near the hitch for easy access whenever you need to hook up.
Good lighting starts with good grounding. The white ground wire is designed to mount to a clean, bare metal surface—no paint or rust—to ensure stable current flow to the trailer lights. Tight fittings and weather-protected connectors help keep corrosion out and signals consistent so your trailer lights work when they should.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Came quick
Easy install.
Delivered on time no problems
works like a charm
Worked perfectly. There was one part missing which you promptly sent.
This was more involved installing then the hitch but works as it should. Thanks
looks heavy duty and weel made.have not installed yet
Fit was perfect ! As always etrailer provided great service!
THIS IS EASY TO INSTALL AS ITS BASICLY PLUG AND PLAY. THE DIRECTIONS ARE EASY TO FOLLOW - TAKES ABOUT 20 TO 30 MINUTES. HAVE DONE THIS TO MY OTHER FORD EDGE.
No problem installing. Instructions and videos help a lot.
another great kit from curt. i install many at my shop. your need to have some good skills working on cars to do this kit
Plug and Play. Works as described. Simple install
Easy to install. Mostly plug and play. Hardest part was running the power wire up to the battery. I watched a YouTube video as I installed the wire harness. Made installation a lot easier!
Brake lights don’t work.
I installed the Curt Trailer Wiring Harness C56292 on my 2017 Ford Edge. The instructions were good, but watched the video for another brand etrailer sells (begins with a "T"), which was the best help. I decided to run the battery wire inside the car, which was really easy. Found out from a blog for people who install subs in Ford Edges, that there is a rubber grummet access thru the fire wall, located on the driver side under the carpet about 4 inches left of the steering column. Ford even has a cutout thru the insulation under the carpet. I pulled the grummet, shined a light thru the hole and it comes out behind the battery. I ran a pull wire from inside the car towards the battery, and pulled the new battery wire back thru. I purchased auto trim removal tools for $9, and this made the job easy! The other variation I did is I decided to run the trailer hookup wires outside thru the rear grummet, and mounted a CURT 58300 Connector Socket Mounting Bracket (cost about $5) thru a hole under the bumper which was already there. Now the plug is always ready! Lights work perfectly. I tested the lights using a Trailer 4-Way Circuit Tester (about 5$). Yes I could have used a volt meter, but I don't know how many times in the past I was renting a trailer and the lights didn't work. They always blame my vehicle, and now I can prove the trailer is the issue, since I can carry the small plug in my glove box.
I am now on my 3rd light module. The first two shorted out internally without blowing the fuse at the battery, now my trunk area perminately smells of electrical fire.
Each time I replaced 100% of the wiring to rule out a short somewhere else, which at least it is an easy install on a 2015+ Ford Edge. The module I have now however has outlived the other two by far. Bad batch maybe.
Mike L.
8/22/2018
Typically, a taillight converter shorting out is caused by a short circuit somewhere in the trailer wiring. Id recommend very carefully examining the wiring on the trailer. Begin at the trailer connector, look for corrosion or for damaged pins. Check the point where the wiring meets the 4-pole plug, its a common failure point. Trace each circuit rearward until it connects at its fixture. Look for loose connections or for bent or pinched wires. Make sure theres no cracks or worn spots in the trailer wiring that would allow the copper wire to short out to the trailer frame. Make sure the connection at each lamp is secure. If the short isnt located and repaired, each subsequent taillight converter thats installed will continue to short out. Ive linked to help articles that explain various troubleshooting strategies.
2016 Ford Edge Sport
Great product & support!
Lacking clear instructions, pictures with perspective and time estimations.
Jimbo
5/29/2018
I have absolutely no problems with all purchases equipment. Works as advertised! Thanks for caring enough to follow-up a year later.
Super easy to install pics on instructions could be a little bit clearer but all and all great product
Mike L.
5/28/2026
You can always use the link on our product page that'll take you right to a .pdf with clear photos. I'll link that for you.
Helpful Links
It would be good if you didn’t have to run the Hot wire all the way to the battery , I could use the 12 V cigarette lighter in the cargo area.. I can’t get under the vehicle, so I guess I gotta have it hired done after all??
Mike L.
7/16/2026
It's really important that you draw the 12V directly from the battery. This totally isolates the vehicle's wiring system from any short circuits that could occur in the wiring on the trailer. If you have access to ramps and a floor jack/jackstands you can lift the rear of the vehicle and run the wire as far forward as you can, then lift the front and finish the run. If you decide to go that route, be sure to chock your wheels!
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Heather A.
5/1/2026
That’s definitely frustrating, especially with a plug-and-play setup like this. If the brake lights aren’t working, it’s usually tied to the power or ground side of the harness rather than the connectors themselves. This kit uses a powered converter that needs a solid connection to the battery, so it’s worth double-checking that the power wire is hooked up correctly and the fuse is installed. Just as important is the ground make sure it’s attached to clean, bare metal with no paint, rust, or coating underneath, since a weak ground can cause brake light issues. It’s also a good idea to confirm the T-connectors behind the tail lights are fully seated, since they can sometimes seem connected when they’re not fully clicked in. If your running lights and turn signals are working but not the brake lights, that can help narrow things down further.