Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2018 Ford F-150
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2018 Ford F-150
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Wiring for trailer lights doesn’t have to mean splicing into factory wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs right into the existing tail light connectors behind the lights. The powered converter and pre-fit connectors make it a plug-and-play job that keeps the factory wiring untouched and hidden once installed.
This harness gives you a standard 4-flat trailer connector to power running lights, turn signals, and brake lights on your trailer. Once it’s plugged in, you’ve got the foundation needed for safe towing or for adding a 7-way setup later using a kit like the ETBC7.
The included powered converter draws power directly from the battery instead of your vehicle’s tail light circuit. That protects sensitive electronics while giving your trailer lights a steady signal. It’s an important feature when upgrading vehicles without a factory tow package.
If you’re planning to tow larger trailers with electric brakes or onboard batteries, this 4-pole harness is the first step. It connects directly to universal kits that add a 7-way plug and brake controller wiring, making it easy to expand your setup later without redoing the original wiring work.
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews
Harness/adapter works fine. No issues.
Install it myself with youtube help, after installation use the hitcher tester, everything work accordingly.
They instructions are decent but I still opted to watch snippets of a YouTube installation as well to help routing of specific wires. Seems to be an excellent product and installation was easy taking about 1.5 hours. Would recommend.
Install was easy and instructions were great! I have used it almost weekly for a year and it has performed flawlessly!
Easy to install, working fine
the videos should show that the 4 little black screw/plugs [ holding the inner light plastic cover ] can be pulled out like a bad tooth!
The wiring harness was easy to install. The connectors fit the factory connectors without any issue. There were plenty of crimp fittings, wire, and zip straps, although I used more zip straps than were probably necessary. I can’t say that Ford made it easy because it was tight getting the wires pulled through.
They're very informative and helpful this was third time I ordered from them.
very well kit...fit just as instructions..wish there was a place to get power in rear instead of running wire all the way to battery, but well made kit
No bracket for 4 pin connetor.
I ordered my trailer towing harness and it arrived before I expected it to. The quality seems top notch. Installation was easy and it functions perfectly.
I installed this on my Ford Bronco Base. The hardest part of the install is getting into the tail light assembly area. Overall it is a straight forward install. I've been using it for a year now with no issues. Towing my boat and off road camping trailer. It has been on long road trips and survived getting bounced around off-road and continuing to work with no issues.
Exactly what I needed. My tail lights were NOT LED and this was the right wiring harness for that. Instructions were fairly simple to follow. Works great.
Very quick shipping.
Instructions were great. Easy to install. No problems so far
Great receiver. Very easy install.
Failed after 20 months of minimal use. The trailer lights stay on even when the Bronco is off (and no vehicle lights are on). I was told the warranty is one year and I can buy another one. I expected this to last longer and will try to find another option.
Jenny N.
5/9/2024
Mike, I have heard of this before. When it happens it means that the harness has experienced an overload and generally is not fixable. It is unfortunately that it happened past the warranty time frame for the harness. I recommend taking a look at part # TK33VR if your 2022 Ford Bronco does not have LED tail lights or part # TK99VR if the Bronco with LED tail lights. We tend to see it happen less with the Tekonsha branded harness.
This is the second one I purchased but unfortunately the first one was for LED lights which I don't have so I had to order another one. This was a mistake on my part and now the lights work as they should but unfortunately I can't return this.
Victoria H.
2/13/2025
Hi Thomas, as long as the wrong item was ordered within the last 60 days and it hasn't been installed or used, you are able to return it. Let me know if you would like help with creating a return label for it.
A little difficult to install but instructions were very helpful
It works great!
Everything fit the vehicle as described.
Works as described. I’m able to pull my boat now with my 2022 bronco black diamond
So glad you helped me with this. I put it on this afternoon and it works. Thanks so much.
Fast delivery! The harness fit perfectly for my 22 Bronco Base without LED Lights.
It's a good harness and works as expected. Installation is kind of a pain. There is no precise way to install it. I would recommend reading the instructions and watching all the videos then deciding how you want to go about it. Note that it doesn't leech off the taillight power. You have to run a power line the length of the vehicle and connect it to the battery terminal. I would have preferred a fuse box tap for that. You also have to use a self-tapping screw to ground it into the frame.
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Brooke M.
5/15/2025
Awesome! So happy to hear that! What are you powering on your Bronco with this harness?