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Easily add a 4-way trailer connector with this custom-fit harness. The T-connector plugs into existing wiring - no cutting needed. Powered converter protects vehicle circuits and ensures consistent trailer lighting for safe towing in any conditions.
The vehicle's wiring harness is often behind a trim panel or under the cargo floor. Some vehicles may require removing interior panels or lifting carpeted sections to reach it, but once accessed, the harness installs easily with quick-splice connectors.
Plugging in a trailer shouldn't mean tearing into your vehicle's wiring. This custom-fit T-connector snaps directly into your factory wiring harness, so you can get your trailer lights up and running without any cutting or splicing. Just plug it in, and you're ready to tow.
A well-lit trailer is a safe trailer. This 4-way wiring harness keeps your trailer's brake lights, turn signals, and running lights powered and in sync with your vehicle. Whether you're hauling a boat to the lake or a camper to the mountains, your lights stay bright and visible.
Some vehicles can't handle the extra electrical load of trailer lights. The built-in powered converter draws power directly from your battery, ensuring a steady, protected current to your trailer while keeping your vehicle's circuits from overloading.
Towing means exposing your wiring to dirt, rain, and road grime. This harness features fully insulated wires and a sealed converter, helping to prevent shorts and corrosion. It's built to withstand the elements so you can tow with confidence in any weather.
No extra trips to the hardware store - this kit comes with everything you need. With fuses, zip ties, and connectors included, you can complete the installation without hunting down extra parts.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody, Andy here with etrailer.com. Let's take a real quick look at this CURT T-Connector Vehicle Wiring Harness with four-pole flat trailer connector. Now, this wiring harness has been designed to fit your 2025 and newer Kia Carnival without the LED tail lights. And on custom fit parts such as this harness, I do recommend taking advantage of our Vehicle Fit Guide here at etrailer.com. Simply input the year, make, and model of your vehicle, and our Fit Guide will confirm if this will work for you or if we have something comparable that will work for you. As you know, a well-lit trailer is going to be a safe trailer, so this four-way wiring harness is going to keep your trailer's brake lights, turn signals, and running lights powered and in sync with your vehicle.
So whether you're hauling a boat to the lake or a camper to the mountains, your lights are gonna stay bright and visible. So this is gonna give you this four-way flat trailer connector at the back of your vehicle to power those trailer signal lights. This is also going to be compatible with five, six, and seven-pole adapters. Those adapters are sold separately. And if you notice, this does come with a dust cap to keep that four-way flat connector clean when it's not in use.
Now, these custom fit T-connectors are going to snap directly into your factory wiring harness so you can get your trailer signal lights up and running without any cutting or splicing. You're just gonna plug it in and you're gonna be ready to tow. Now your vehicle's wiring harness is often behind a trim panel or under the cargo floor. Some vehicles may require removing the interior panels or lifting carpeted sections to reach it, but once you access it, the harness is going to install easily with these T-connectors. The instructions will guide you through the installation process, showing you where you can find the harness on your vehicle.
Now, some vehicles can't handle the extra electrical load of trailer lights. The built-in powered converter right here is going to draw power directly from your battery. So that's going to ensure a steady, protected current to your trailer while keeping your vehicle circuits from overloading. So this kit is going to come with everything that you need. It's going to come with a fuse holder, fuse, cable ties, butt connectors, a terminal, a ring terminal rather, for your battery when you're installing this to your battery.
Wiring to run to your battery as well. So everything that you're gonna need to get this up and running. And it is also recommended that you use a small amount of dielectric grease on all of your electrical connections, like the plugs on the vehicle end and the four-pole flat connector itself. That grease is designed to help prevent electrical failures caused by corrosion and moisture. So on your screen, I am including our model number, our item number for that grease. You can just take that number and pop it in the search field of our website. That will take you to the grease and you can add that to your order. If you do decide to pick this up, we would love to hear back from you regarding how the installation went and how using this wiring harness is working out for you. So you can share your experience with us by dropping a comment or leaving a review on this product page. We would love to hear back from you. Well, I think that's gonna wrap up our look today. I do hope that it was helpful for you. Again, my name is Andy, thank you for joining me.
Easy too install. If installing on a 2025 Kia Carnival though the instructions for the tail light removal is misleading. It says to remove the tail lights by pulling outward on them from the side of the vehicle but the tail lights have to be pulled out by standing behind the vehicle. But the lights work great. Will be towing a trailer across country so will update review after.
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Brooke M.
6/7/2025
Thanks for the heads up tip about the lights! That is good to note. When do you embark on the road trip?