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Wiring a trailer usually means slicing into factory wires, but this harness makes it simple. The Curt T-Connector plugs directly into the existing wiring to give you a 4-flat trailer connector. No splicing or wire chasing—just plug in and it’s ready to tow.
The built-in powered converter keeps the trailer lights working correctly by drawing power directly from the battery instead of the vehicle’s tail light circuit. That means steady, reliable signals for running, turn, and brake lights without overloading the factory wiring.
The hidden, vehicle-end connector tucks neatly behind trim panels for a factory look. It uses existing grommets and routing paths, so there’s no need to drill holes or leave wires hanging under the bumper. The result is a clean, protected setup that looks like it came built in.
The 4-flat connector handles the essentials—running lights, turn signals, and brake lights—for small and mid-size trailers. It’s the standard connection used on most trailers, so you can hook up and go without extra adapters or wiring changes.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to be taking a look at the Curt T-Connector Vehicle Wiring Harness with the 4-pole flat trailer connector. This product fits certain years and models of the Hyundai Elantra. It's going to provide a 4-way flat connector at the back of the vehicle to power your trailer signal lights. This is compatible with 5-pole, 6-pole, and 7-pole adapters. Adapters are sold separately. It's going to come with a dust cap for the 4-way flat plug.
That way you can cover up the connection points when the plug is not being used. the black box on the unit, that's this right here, this is going to be the included tail light converter. This is going to ensure that your vehicle's wiring matches that of your trailer's. The power module's going to connect directly to the battery through the wiring and that's going to help avoid overloading the vehicle's electrical system. It's going to be constructed using surface bound 00:00:43 technology for consistent, reliable performance. What that does is, it maximizes the trailer light yield and intensity while producing minimal heat and it's going to ensure superior operation even in rough road conditions. Now this system's going to connect quickly and easily.
All you have to do is look at the connection points in the rear cargo area. You're going to have 2 sets of connectors. The set with the green wires going to go to the passenger side. The other set's going to go to the driver's side. You locate the connection points, you plug them in.
They're going to snap lock together. The connectors are going to match up perfectly with one another. Once you get those connected, you'll need to make a good ground connection. That's going to be the white wire with the attached ring terminal. You want to get that grounded to a nice, clean metal surface with the included grounding screw, and then you can mount the converter box using the double-sided adhesive tape that's provided with the kit.
That way you can get that mounted to a nice clean, out of the way location. Then you'll need to run the hot lead to the vehicle battery. That's going to be the black wire right here. This is going to get connected to the bundle of black wire with one of the included butt connectors. The other end of the black wire runs to the vehicle battery, gets another butt connector attached to it and connects 1/2 of the fuse holder. The other half of the fuse holder gets a ring terminal attached to it, and gets connected with the positive posts of the vehicle battery. It also comes with your 10-amp fuse, goes right here into the fuse holder. That's got the fuse cap to keep the fuse safe and secure. Once your installation's complete, the 4-way connectors are going to be stowed in an out of the way location within your cargo area. The kit's also going to come with some zip ties, that way you can secure the excess or slack in the wiring that you may have. It's going to come with detailed installation instructions to walk you through the process, step-by-step. It is recommended that you use a small amount of grease like some dielectric grease on all of your electrical connections, like right here the plugs on the vehicle and the 4-pole connector itself. That grease is going to help prevent corrosion to the connection points. It is sold separately so if you need some, you can find some here at Etrailer.com. When it comes to the maximum amperage for the stop and turn lights, we're looking at 3 amps per circuit. For the tail lights, we're looking at 6 amps per circuit. That's going to do it for today's look at the Curt T-Connector Vehicle Wiring Harness with the 4-pole flat trailer connector.
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David
5/17/2025
great easy to wire up still working like its supposed to