Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
This item does not fit your vehicle
2015 Toyota 4Runner
These items fit your vehicle
2015 Toyota 4Runner
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Wiring a trailer often means tapping into factory wires, but this harness skips all that. The CURT T-Connector plugs directly into existing vehicle connections to give you a clean 4-flat trailer plug. No wire cutting, no splicing—just a simple plug-in setup that’s ready to go.
Many vehicles need extra protection when connecting trailer lights. This harness uses a powered converter to draw power directly from the battery instead of the vehicle’s light circuits. It keeps the system safe and ensures your running, turn, and brake lights work consistently every time you tow.
LED trailer lights can sometimes cause flashing or error signals with standard wiring, but not with this harness. The CURT T-Connector is built to handle LED compatibility right out of the box, so you get steady light function without extra adapters or resistors.
The wiring stays tucked away behind trim for a neat look when you’re not towing. When it’s time to hook up the trailer, pull out the 4-flat connector and you’re ready to roll. Once finished, it stores back out of sight—protected from dirt and weather until the next haul.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Arrived on time in great shape. Looks like it will fit, but won't install for 2 days
I did not install yet - waiting on some other interior trim pieces. This is a custom match for my 2024 Sienne, so no cutting of wires needed.
Too easy to be true! Took me about one minute to install.
Installation was about as simple as it gets. Truly plug and play.
So easy to install, especially with the car specific videos
Easy install, works well.
Very easy to install the video they have was easy to follow excellent service best place for anything trailer period
Easy install and worked great!
Great communication, great packaging
Excellent Help. Very satisfied.
Awesome product. One connector and done.
Easy to install. Works perfectly.
One screw, one plugin, instructions were a little different from the trim as built. Hardest part was Dremmeling the cable hole through the trim !!!
Ordered this for my ‘25 sienna (with the spare tire) and install was so simple after I was dreading taking all the trim pieces off. All I had to do was remove the spare tire cover, locate the plug, and plug it in. SO SIMPLE!
Arrived on time. Snapped right in. Tested perfect.
Worked as expected.
Perfect solució
Easy install. Just plugs in. i haven’t used it yet, but i am confident it will work fine.
Another easy install. The connecter plug was a match with my Toyota 2026 Sienna. I opted to leave the 4-pole wiring inside my trunk so there was hardly any work to it and the install took maybe 15 minutes.
Install video was perfect. I watched it once before install. Everything fit as described.
Easy plug and play but seems a little high price but what are you going to do
The videos on this site are amazing. Both to diagnose, shop, and install my product. The shipping seemed a little longer than I expected, but it did get here on time.
This is well worth the money. Makes trailer wiring extremely easy. Highly recommend
As with all of your products and services, everything is presented and supported at the highest level. Product descriptions give the customer an opportunity to select what best fits their needs. If there is uncertainty, a quick phone call to customer service is handled by representatives that know and understand the product. i have been a customer for several years and have never been disappointed.
This wiring harness also had a supporting video on the company website that eliminates any guesswork. It works very well.
I have the Sienna with the spare tire in the back. With this set up it takes less than 5 minutes to install and test. Awesome plug and play wiring harness.
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