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Wiring a trailer usually means tapping into factory circuits, but this harness makes it easy. The Curt T-Connector plugs directly into existing vehicle connectors to create a 4-flat trailer connection. No cutting or splicing is needed—just plug it in and you’re ready to tow.
Trailer lighting can overload delicate vehicle wiring, but this harness uses a powered converter to isolate the trailer lights from the vehicle’s electrical system. It draws power directly from the battery, protecting the factory circuits from shorts or overloads while providing a consistent signal to the trailer lights.
The 4-flat connector gives you everything needed for standard trailer lighting—running lights, turn signals, and brake lights. It’s the common setup for utility trailers, campers, and small boats, giving you visibility and safety every time you hit the road.
If a light stops working, checking connections is simple. Each wire is color-coded and easy to reach, so you can test for power at the input or output side of the converter box without taking everything apart. This makes diagnosing issues like a lost running light circuit or shorted converter straightforward.
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 Part Number C56048. This is the Curt T-Connector vehicle wiring harness. It's going to provide your 4-pull flat trailer connector. This product is going to fit your 2006 to 2012 Ford Fusion. It's going to provide your 4-way flat trailer connector at the back of your vehicle to power your trailer signal lights. This is compatible with 5-pole, 6-pole and 7-pole adapters.
Adapters are sold separately. And it's going to come with the dust cap for the 4-way flat connector, that way you can cover up those connection points when your plug is not being used. The black box right here, this is going to be the included powered taillight converter. This is going to connect directly to the vehicle battery through the wiring to avoid overloading the vehicle's electrical system. It's going to be constructed using surface-mount technology, which is going to offer 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, a benefit of a system like this is that it's designed to connect very quickly and easily.
It's going to come with your detailed instructions. These are going to walk you through the installation process step-by-step, but you'll need to begin by locating the connection points in the rear cargo area. You're going to have two sets of connectors. This set with the green wire, that's going to go to the passenger side of the vehicle. The set with the yellow and brown, that's going to go to the driver's side of the vehicle.
Again, this is a custom-fit vehicle wiring harness, so the plugs are going to match up perfectly with the plugs on the vehicle. You're going to plug them into one another, and then they're going to snap-lock together for a nice, tight, secure fit. So once you have those plugged in, you'll need to make your ground connection. That's going to be your white wire with the ring terminal attached to it. They provide a self-tapping screw so you can get that grounded to a nice, clean metal surface. And then you're going to need to mount the converter box to a clean, out of the way location.
You can do that using the double-sided adhesive tape provided with the kit. The next step is going to be to run the hot lead to the vehicle battery. The hot lead is going to be the black wire coming out of the converter box. You're going to attach a butt connector on to it. It is included. And then you're going to connect it to the bundle of black wire. The other end of the black wire goes up to the vehicle battery. It gets another butt connector attached to it, and that's going to connect to one-half of the fuse holder. The other half of the fuse holder gets a ring terminal attached to it, and that's going to get connected to the positive post on the vehicle battery. It does come with your 10-amp fuse. It goes right in this area here and it's got the fuse cap to keep it protected. So once you have all that done, you can go and secure any excess or slack in the wiring with the included zip ties. and then once the installation is complete, the 4-way connector is going to be stowed in an out of the way location within the cargo area. When it comes to the maximum amperage for the stop and turn lights, we're looking at 3 amps per circuit, and for the taillights we're looking at 6 amps per circuit. It's also recommended that you use a small amount of dielectric grease on all your electrical connections like the plugs on the vehicle and the 4-pole connector itself, and that's going to help prevent corrosion from settling into those connection points. The grease is sold separately, so if you need some, you can pick some up here at etrailer.com. That's going to do it for today's look at Part Number C56048.
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