To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Wiring a trailer can be messy if you have to tap into factory wires, but this Curt T-Connector keeps it simple. It plugs straight into the vehicle’s existing wiring, giving you a clean 4-flat trailer connector without cutting or splicing. The plug-and-lead setup makes it a tidy install that looks factory once finished.
The built-in 4-pole flat connector handles the essentials—running lights, turn signals, and brake lights—so you can tow small and mid-size trailers with confidence. It’s the standard connection that most trailers use, and it makes checking your lights fast and straightforward.
Built into the harness is a converter that safely combines the separate brake and turn signal circuits. That means your trailer lights work correctly without overloading or confusing the vehicle’s electrical system. It’s designed to communicate cleanly with the vehicle wiring while keeping signals bright and consistent.
No factory tow package? No problem. This harness is made for vehicles that don’t come prewired for towing. You still get a reliable trailer light connection by simply plugging into the taillight circuits—no extra modules or dealer programming required.
The compact plug-in design tucks neatly behind trim panels and out of sight once installed. The wiring stays protected and hidden, giving you a neat finish that looks like it came from the factory.

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 at this Curt T-connector vehicle wiring harness with four pole flat trailer connector. Now, this wiring harness has been designed to fit your 2019 to 2022 Acura RDX with the plus 12 volt power provision. And on custom fit parts such as this harness, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Just 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 going to give you that four pole flat trailer connector at the back of your vehicle to power your trailer signal lights.
This is also going to be compatible with five, six, and seven pole adapters, those adapters are sold separately. And as you can see here, this does include a dust cap for the four pole flat connector. That dust cap is gonna cover up those connection points when the plug is not in use. Now, a taillight converter is built into this T-connector because most trailers run on a two wire system where the brake and turn signals are carried on one wire. The separate brake and turn signals from your vehicle's three wire system, they need to be combined so they are compatible with the wiring system of your trailer.
So, this converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer signal lights. This will not affect how your tail lights on your vehicle operate. And by the way, Curt does build each taillight converter using surface mount technology for consistent reliable performance. It's gonna maximize trailer lie yield and intensity while producing minimal heat, and it's going to ensure superior operation even in rough road conditions. So, this harness is designed to connect quickly and easily, this custom fit T-connector is going to plug into your vehicle's wiring harness, which is gonna be located behind the driver's side interior trim panel in your rear cargo area.
Then, you will need to mount this converter box to a safe out of the way location. You can do that a number of ways. You could take another self-tapping screw that you might have on hand and run it through the top hole. You could maybe even use one of the many cable ties that's included with the kit. This does include this double-sided adhesive tape.
You could use this, but I would also recommend using a second way to secure this, so maybe like I mentioned, another cable tie or another screw, something like that just to make sure that it's going to stay in place. Now, you're going to be able to secure any excess in your wiring or slack in your wiring with the cable ties. I did wanna point out that our ground wire is here with a terminal there, a ring terminal. It does come with a self-tapping screw to get that grounded and on a clean rust-free surface. Instructions are included to guide you through the installation process. It is also recommended that you use a small amount of dielectric grease on all of your electrical connections, like the plugs on your vehicle and the four pole connector itself. The that grease is designed to help prevent electrical failures caused by corrosion and moisture. So on your screen, I am including our part number for that grease, you can just take that part number, pop it in the search field of our website, that will take you to that grease, and you can add that to your order! Well, that's gonna wrap up our real quick look today. I do hope that it 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
Good product. Fit like it's supposed to. Easy to install.
Perfect fit. Has been one year since I installed it. Works great. Good product fair price
Super easy install. 100% plug and play. Plug the module into an open plug on the car, attach the ground wire to an existing ground, done.
This application worked perfectly for a 2021 Acura RDX. Had trouble removing the trunk tie down brackets. Everything else went smooth.
Easy peezy lemon squeezy....quick insta ll
Was not expecting to have run a power wire on my 2025 Acura RDX. Kit did not include it and UHaul did a last minute repair thankfully
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