To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody. Andy here with etrailer. Let's take a quick look at this Curt T Connector vehicle wiring harness with four pole flat trailer connector. Now this is a custom fit harness that's designed for your 2019 to 2025 BMW X4, excluding the M40I and then for your 2021 to 2025 BMW X4, and that is for the M40I. Now on custom fit parts such as this harness, I do recommend taking advantage of our vehicle fit guide here at etrailer. Just input the year, maker and model of your vehicle and answer any other questions that it might have for you.
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 wiring harness is designed to be completely custom fit for your vehicle, so installation's gonna be pretty straightforward and hassle free. This is going to plug directly into your vehicle's existing wiring. So what that means for you is no cutting splicing or guesswork. Once installed this is going to power all of the essential trailer lights, including your brake turn signals and running lights.
So you're gonna stay legal and visible on the road. This also uses this powered converter that's going to connect directly to your vehicle's battery. So that's important because this is gonna protect your vehicle sensitive wiring system and it's gonna prevent overloading the factory circuits. This wiring is fully insulated to help reduce the risk of shorts or electrical interference with your vehicle's other electronics. Plus, this is designed to handle the elements and everything is going to be protected and heavy duty.
So it's gonna hold up really well for you and to make things simpler, this does come as a complete kit with everything that you're gonna need for installation, including a fuse, and connectors, cable ties. So you're gonna be able to secure everything properly the first time. So this is gonna be a clean, safe, reliable way to add trailer wiring without complicating your vehicle's electrical system. Now on your screen I am including a model number for dielectric grease that is recommended that you use that grease on all of your electrical connections, like the plugs and the four pole flat connector itself. That grease is designed to prevent electrical failures caused by corrosion and moisture.
So on your screen I'm including the model number for that grease. You can just take that model number and pop it in the search field of our website. That will take you to that grease and you can add that to your order. If you happen to have any other questions, don't hesitate to reach out. We do wanna make sure that you're getting exactly what you need. Well, again, my name is Andy. Thank you for joining me.
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.



Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.