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This Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the vehicle’s tail light wiring. There’s no need for cutting or splicing factory wires. It’s a clean, plug-in setup that makes wiring a trailer simple and secure for DIY installs.

When not towing, the 4-flat connector stays tucked inside the trunk. Just route it out when you need it and close the trunk over the wire to hold it in place. This keeps the connector out of the weather, reducing corrosion and keeping it ready for your next trip.
If you prefer a fixed exterior connection, you can mount it using a 4-Flat Mounting Bracket #18144. For a no-drill install, a short bracket #18140 or long bracket #18136 can be added. This lets you choose a neat, permanent setup if you want the connector accessible outside the vehicle.
The powered converter in this harness provides proper power to the trailer lights while protecting sensitive vehicle electronics. It handles the signal conversion for running lights, turn signals, and brake lights through the 4-flat connector, giving you dependable lighting every time you tow.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to review part number C56230. This is Curt T-Connector Vehicle Wiring Harness with the 4-way flat trailer connector. This is a custom fit part. It is designed to fit the Dodge Challenger starting in 2015. If I want a custom fit part what I would recommend is to go to our website, use our fit guide. Put in your year and model vehicle, and it'll show you if this part will work for your application. This will provide a 4-way flat trailer connector at the back of your vehicle to power your trailer signal lights.
It does connect quickly and easily. There's no cutting or splicing of wires. Basically, you use these plug in T-connectors. They would usually plug in behind your rear tail lights in your rear cargo area, and then you run this power lead to your battery to supply power to the converter. It does include this powered tail light converter, and this will connect directly to the battery, and it avoids overloading your vehicle's electrical system.
This converter is constructed using SMT technology, which is surface mount technology. It gives you consistent, reliable performance. It will maximize your trailer light yield and intensity while producing minimal heat. It also insures superior operation in any rough road conditions. This part comes with everything shown here on the table. I'm going to show you how this all connects here in a minute.
It is made in the U.S.A. A few specs on this harness, the maximum amperage on the stop and turn light circuit is 3 amps per circuit. On the tail light circuit it's 6 amps. Again, it comes with a nice set of detailed instructions. Step-by-step instructions, how to install it, and even pictures of your connection points. Basically, what you would do is go to rear of your vehicle, and in your rear cargo area you'd go start on the passenger side and you'll find the T-connector that has the green wire in it, that's for the passenger side tail light.
You'll go over to the passenger side and unplug behind the tail lights, plug this in, and then plug the wiring harness into this. Then you also notice on this side they'll be a white wire. This white wire has an eyelet on it, that's for a good ground. You want to make sure you connect this to a good clean ground. If there is one there go ahead and connect it, if not they include a grounding screw that you can drill a hole and make your own ground. Then what you'll do is take this length of yellow wire with the T-connector on it. This is for the drivers' side. You'll run this length of wire over to the drivers' side behind the tail lights, and go ahead the same way, unplug it and plug this in line to the tail lights. With those all connected you'll have your remaining black wire. This is what needs to run to your battery. On the Dodge Challenger the battery will be in the trunk. This already has an inline fuse holder connected to it, so what you'll want to do is run this wire to your positive post of your battery. You'll connect this, this eyelet will connect to the positive post, and what you'll want to do is open up the fuse holder. They include this 10 amp fuse that you'll want to put into the fuse holder, and then go ahead and put the cover back onto it. Now when you do run all these wires, there you go, got your cover back on. When you do run all these wires if you have any of them that are hanging down they do include some cable ties to help take up any slack. Then what you'll do is this will run out the back and plug into your trailer, so this is all connected ready to go. Last thing you might want to do is take this double-face tape, attach it to the bottom of your converter. You don't want to have it flopping around, so you'll attach that and connect this, peel the tape off, connect it to a nice flat surface so it doesn't move around. Then your last thing is your dust connector, or your dust cap. You go to your 4-way, and when you're not plugged into your trailer what can do is go ahead and put your dust cap on there, and can leave that on if you'd like. When you're not plugged in put the cap over the terminals, and that helps protect them from any damage, or from the elements. After that's all connected you're all pretty much ready to go. This plugs into the trailer and will supply the signal lights on your trailer. That should do it for the review on part number C56230, the Curt T-Connector Vehicle Wiring Harness with the 4-way flat trailer connector.
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Mike L.
3/31/2026
Usually that's caused by a short circuit in the trailer wiring. You'll want to trace each of the taillight circuits on the trailer. Look for loose connections, pinched wires or cracked or worn wire insulation that would allow the circuit to short to ground.