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The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector is built with plug-in connectors that tie directly into the factory tail light wiring. There’s no cutting, splicing, or guessing which wire goes where. Just connect the harness to the existing plugs and you’re ready to power your trailer lights.
Once installed, the 4-flat connector delivers the standard running lights, brake lights, and turn signals your trailer needs. It’s a simple, reliable setup that works for basic towing and keeps everything operating in sync with your vehicle’s lights.
The built-in powered converter handles the electrical load safely when running trailer lights, even with sensitive vehicle wiring or LED systems. It draws power directly from the battery instead of overloading the vehicle circuits, so your lights stay bright and stable every trip.
The harness tucks neatly behind trim panels using existing factory grommets for routing. When finished, only the 4-flat plug sits near the hitch for quick access while everything else stays hidden and protected from the elements.
Customer Satisfaction Score:
65% were satisfied with this product
35% of customers were not satisfied
Ratings & Reviews

Ronald S.
4/26/2022
My mistake, I received the light kit inside the box that the trailer kit came in.

Victoria H.
11/14/2024
Hi Jeff, this will fit onto your 2021 Nissan Sentra. Please let me know what part you received, so I can make this right for you.
Do you have a question about this Custom Fit Vehicle Wiring?
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Katrina B.
4/26/2022
I see that you have also received a hitch receiver. We like to keep all of the items in the same box. Can you please check the box holding your hitch to make sure that the wiring harness is not also in there?