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Wiring a trailer doesn’t have to mean cutting into factory wires. The Curt T-Connector plugs straight into the vehicle’s existing tail light connectors to create a 4-way flat trailer plug. It’s a simple, hidden install that keeps everything neat and avoids guesswork with splices.
This harness uses a powered converter that draws power directly from the vehicle battery instead of the lighting circuits. That means your trailer lights get steady, clean power without overloading the factory wiring. It’s the right setup for trailers with standard or LED lights.
No tow package? No problem. This kit is built to add a 4-flat connection even when the vehicle didn’t come ready for towing. It includes the power lead needed to run up to the battery so everything works like it should once connected.
Once installed, the wiring stays tucked away and out of sight until you need it. The plug-in design routes through existing trim for a clean look and protection from weather and road debris. It’s ready when you need it and invisible when you don’t.
The 4-way flat plug provides running lights, turn signals, and brake lights—everything needed for most small and midsize trailers. It’s the common standard that matches up easily with trailer wiring, so you can hook up and go with confidence.

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 look together at this Curt T-connector vehicle wiring harness with 4-pole flat trailer connector. Now this wiring harness is designed to fit your 2024 and newer Chevrolet Trax. And on custom fit parts such as this wiring harness, I do recommend taking advantage of our vehicle fit guide here @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.
Now this harness is gonna give you a 4-pole flat trailer connector at the back of your Trax to power your trailer signal lights. This is going to be compatible with your 5-pole, 6-pole, and 7-pole adapters, and those adapters are sold separately from this harness. And as you notice here, we do have this dust cap that's going to go right over that 4-pole flap plug to protect those connection points from dirt, dust, debris, moisture when you're not using it. And then when you're ready to use it, you just take that cap off and it'll be clean and ready to go. Now the black box on this harness is a power taillight converter.
This is going to ensure that your vehicle's wiring matches out of your trailer. It does connect directly to your vehicle's battery to avoid overloading the vehicle's electrical system, and so it's gonna reduce strain on your vehicle's wiring system. And in case you didn't know, Curt does build each converter using surface mount technology, that's gonna give you consistent, reliable performance. It's gonna help maximize trailer light yield and intensity while producing minimal heat, ensuring superior operation in rough road conditions. Now this harness is designed to connect quickly and easily.
You will need to locate your vehicle's wiring harness and typically it's located behind the taillight housings. You'll have to remove those taillight assemblies to access that harness. And then once you locate the connectors, you're gonna separate the connectors carefully. You don't wanna break the locking tabs. And then you will insert these T-connector ends between your vehicle's wiring connectors and then lock them into place.
These T-connectors are custom fitted for your Trax, so they will match up perfectly with the connection points on your vehicle and they'll snap and lock together for a tight secure fit. Now once you have those plugged in, you will need to make a good ground connection and that's going to be this white wire here. And if you notice, it does have a ring terminal attached to it, and it does come with this self-tapping screw so you can get this wire grounded to a suitable location such as your vehicle's frame or crossmember. You just wanna make sure that the surface you mount this to is clean and rust-free. Next, you'll want to mount the converter box to a safe out-of-the-way location. You can do that a few different ways. First, if you have another mounting screw, you can use one of those, run it through the top hole here and mount it that way. Or this does come with double-sided adhesive tape that you can use, or you can use one of the many cable ties that's included in this kit. Next, you'll wanna run the hot lead to your vehicle's battery. That's the short black wire that's coming out of the converter box. This short black wire is going to get connected to one of the ends of this included bundle of black wire using one of the included butt connectors. And then the other end of this bundle is going to get routed to your vehicle's battery. And once you have this other end routed to that battery, you're going to take this fuse holder that you see right here. You're gonna snip that wire in half. And then take the other butt connector and take one of those wires that you snipped in half here of this fuse holder and then connect it to that routed end of this bundled wire. And then you will take this ring terminal and connect that to the other end of this wire that you split, that you cut in half there, and then you will take that ring terminal and attach that to the positive post of your vehicle's battery. This does come with a 15-amp fuse and that's gonna go right into this holder there. And then if you notice, it has a cap that's going to keep that fuse safe and protected. Now, you can secure any slack in your wiring with the mini cable ties. It's included with this kit. The maximum amperage for the stop turn lights is 5 amps and for the taillights it's 7.5 amps per circuit. So instructions are included to guide you through the installation process. 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 and the 4-pole connector itself. That grease is designed to help prevent electrical failures caused by corrosion and moisture. So on your screen, I am including our item number for that grease. You can just take that item number and put it in the search field of our website and that will take you to that grease and you can add that to your order if you are in need of it. Well, I think that's gonna wrap up our look today. I do hope that our time together was helpful for you. Again, my name is Andy. Thank you for joining me.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Great prices great service
+++
Awesome!
Pretty easy install but did run wires inside of car instead of under car
Installation was easy and took about 2 hours.
Product worked perfectly easy to follow directions even though I've done this type of work professionally
Easy Install Plug and play !
Great product. I will order again from etrailer because of their great selection of products and their quick time from point of purchase to getting it out same day. Great company.
Great product, only gripe is the instructions, could use a little more detail
Fits perfect on 2026 Chevrolet Trax
Great quality, Directions could be better but they worked.
Easy installation and proper fitment
Awesome service
Easy install. Works as described
According to your application guide, this kit was supposed to work for a 2024 Chevy Trax. The connectors did not match at all. I paid for Next Day Air shipping as well. Now I am out my shipping charges, I have a kit I can't use and a customer I can't help.
Curt connectors worked and fit great. Only problem is getting to a 12v line. I solved this issue by using the cig. lighter. Too difficult getting to the battery under the hood. Great product and time saver.

James
4/13/2026
Connectors and hitch still working as they should after a year of use.
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Billy
9/29/2025
Still works great