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Wiring a trailer often means dealing with wire splicing or tracking down the right connections, but this Curt T-Connector makes it simple. It plugs directly into the vehicle’s existing wiring to give you a clean 4-flat trailer connector. There’s no need to cut or modify anything—just plug it in and it’s ready to go.
The harness tucks neatly out of sight for a clean, hidden setup. Once installed, only the 4-flat connector is visible when you need it. When not in use, it stays protected and out of the way, keeping your setup looking stock and tidy.
This plug provides the essential lighting functions—running lights, turn signals, and brake lights—so your trailer stays fully visible on the road. The standard 4-flat design works with most small and mid-size trailers, giving you dependable connectivity every time you tow.
With its plug and lead setup, this harness comes ready to connect right out of the box. There’s no extra wiring or converter needed, making it a straightforward solution for anyone adding trailer lighting for the first time or replacing a faulty setup.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to show you the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number C55383. Let's take a quick look at it. It's going to be a very simple wire harness. First off, we'll go ahead and take a look at what's called the T-connector. That's this assemble right here. The one with the yellow wires always goes towards the left-hand side. We have a T-assembly where the green wire now goes to the right-hand side.
We've got a generous, long length of wire we have bundled up right here that will reach to both sides very easily. Then it comes out to our 4-pole flat right here. That will go onto your trailer. Additionally, to the 4-pole flat it's also provided with a cover when it's not being used. Also, for your installation, it also comes with some zip ties and screw for grounding the white wire to the sheet metal, which is this one right here.
This ground wire will be typically installed on the passenger side. Let's go back to the T-connector real quick. They're very easy to install. Basically, you have a little tab right here which you pull up and you can pull it apart. I can actually put two together, and this will show you what to look for on the inside of the vehicles because these will match up to ones behind tail lights. Pull up on the tab, and they come apart.
Then your T-connectors will go right in between. That will finish it for the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number C55383. .
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