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Wiring a trailer can be intimidating when you have to splice into factory wiring. This harness skips that step entirely. The Curt T-Connector plugs into the tail light wiring behind each assembly, giving you a clean 4-flat connector without touching or altering any factory wires. It’s a quick plug-and-play setup that’s ready to go once connected.
Towing setups need stable power for trailer lights, and the powered converter on this harness makes sure of it. The hot lead runs directly to the vehicle battery through an included fuse holder, protecting both vehicle circuits and trailer lighting. It keeps your trailer lights powered without overloading the vehicle wiring.
Once installed, the harness provides a standard 4-pole flat connector that handles running lights, turn signals, and brake lights. It’s the go-to connection for most small or midsize trailers and works with LED trailer lighting.
Keeping the 4-flat plug secure and easy to reach is simple with an optional mounting bracket like part #18144 or #18136. These let you attach the plug neatly to your hitch or bumper cross tube so it’s protected and ready whenever you need to tow.
Even if your vehicle didn’t come with a tow package, this harness is designed to add trailer wiring safely. The plug-and-lead setup, powered converter, and weather-sealed connectors give you everything needed for reliable trailer lighting on vehicles that lack factory provisions.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Randy
7/8/2025
Its been about a year and have not had any issues.
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Mike L.
9/23/2026
That's awesome, Gary! glad to hear that!