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Running trailer wiring often means cutting into factory wires, but this harness skips all that. The Curt T-Connector plugs in line with the existing tail light wiring, so you get a 4-flat trailer connector without any splicing or wire tracing. It’s ready to use right out of the box and connects cleanly for a quick setup.
Once connected, the harness gives you a standard 4-flat output that powers your trailer’s running lights, turn signals, and brake lights. It’s the essential first step for towing small or mid-size trailers and makes it easy to upgrade later if you need a 7-way for brakes or a 12V charge line.
If you plan to tow a trailer with electric brakes or need accessory power, this 4-way sets the foundation. You can easily pair it with the Brake Controller Install Kit and 7-Way Adapter #ETBC7 to add a fully functional 7-way connector. That setup supports brake control and trailer battery charging without redoing your wiring.
The harness uses a plug-in vehicle-end connector that fits neatly behind panels and trim. With no converter box or extra modules to mount, it keeps the wiring out of sight and protected while maintaining easy access to your 4-flat plug when you’re ready to tow.
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Katrina B.
4/18/2022
From further inspection, I do see that this does not look like the plug you are supposed to be plugging this harness c55350 into. In the background of the photo you provided, the plug that you are supposed to be using is plugged into the vehicle behind the plug at the forefront. That plug would need to be undone and the T-harness c55350 would be connected. Generally, with these harnesses they will tie into the taillights, opposed to the OEM Ford plug that would plug into that plug at the forefront of your picture.