Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2025 BMW X6
These items fit your vehicle
2025 BMW X6
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Wiring up a trailer can be a headache if you have to cut into factory wires, but this Curt T-Connector makes it simple. It plugs right into the existing vehicle connectors so you get a clean, secure link without splicing or tracing wires. Just click the plugs together and you’re ready to go.
The 4-pole flat connector handles running lights, turn signals, and brake lights—everything your trailer needs to stay visible and road legal. It’s a standard, dependable setup for light- to medium-duty towing and connects easily to most trailer wiring harnesses.
Some vehicles don’t provide enough signal power for trailer lights, especially when towing LED-equipped trailers. The integrated powered converter makes sure the trailer lights get steady current without overloading the vehicle’s circuits. That means consistent brightness and fewer wiring issues down the road.
If your vehicle didn’t come equipped for towing, this harness fills in the gap. It supplies a complete wiring connection so you can hook up a trailer safely without adding extra components or modifying the electrical system. Plug it in once and it’s ready whenever you need to tow.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everyone, Steven here with etrailer.com. Today we're looking at our CURT T-connector vehicle wiring harness with a four-pole flat trailer connector. Now folks, this is a custom fit application. It looks like it's gonna fit a 2015 through current year Ford Transit T350 without a factory trailer connector. So I want you to verify that with our fit guide here at trailer.com. On our homepage, enter things like your make and model under My Vehicle Information.
Make sure you're getting the right parts the first time. Keep in mind these videos can be outdated and it could fit potentially newer years. Now this again, custom fit, what you're gonna do is in the trunk area, most likely of your vehicle, you're gonna be installing this modular box and these T-connectors, we call them T-connectors because of the shape. Now if you could picture the letter T here, right And what you're gonna do is you're gonna unplug the factory plug behind that taillight in your trunk area, and then this will plug right into that spot or this one, whichever one you unplug will match up, and then you'll plug the one you unplugged into this other one, thus creating a connection without cutting or splicing. As you can see, you got a ground wire here.
You got your four-pole connector that would go out the back to then attach to your trailer. You have a black wire here that's gonna be for power that's gonna run all the way up to the battery with this included wire. And you're gonna have an inline fuse, and the fuse and all the butt connectors you need and the cable ties to make those connections and keep that wire nice and clean are included. This is a dust cover. It's gonna go right over the end of the four-pole connector once you've got everything installed.
Now this modulator box, this basically is a power converter. For safety, it's going to keep all the signals, input and output being the correct amp, wattage, et cetera that's needed to then communicate with the trailer wiring and the lights and everything to make sure everything's working correctly, and also to help prevent backfeeding or any kind of things like that. So, very nice unit, the power unit there is very essential. Again, you get everything here out of the box. So it should be a pretty simple installation for the most part, just follow the included instructions.
We might also have some videos on our website as well for your particular installation. Folks, that is gonna wrap it up for our look together. I'm Steven, as always, stay safe while you're towing.
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