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Wiring a trailer can get complicated fast, but this harness keeps it simple. The Curt T-Connector plugs directly into the taillight wiring, so there’s no need to cut or splice factory wires. It gives you a 4-flat trailer connector for running lights, turn signals, and brake lights—all with a clean, hidden install behind trim panels.
The powered converter takes all the strain off your vehicle’s lighting system. It uses a black power wire that connects straight to the battery, so the trailer lights draw current from there instead of the vehicle circuits. This setup isolates the power supply to prevent shorts or overloads from damaging your factory wiring.
Good grounding is key to trouble-free towing. The white ground wire attaches to bare metal free of paint or rust for a steady connection. Curt recommends using dielectric grease on all terminals to keep moisture and corrosion out—an easy step that helps prevent lighting issues down the road.
The 4-pole flat connector is the standard hookup for most small and midsize trailers. It handles combined stop and turn signals on the yellow and green wires, plus running lights on the brown wire. It’s an easy way to get all basic trailer lighting functions ready to go right out of the box.

Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
Ratings & Reviews

Maria C.
6/24/2015
Still Great

John S.
10/18/2017
This system looks and works well. Cant beat the quality and no indication of surface problems looks as good now as the day I installed it!!!

Mike L.
7/23/2018
Usually the connectors you located wont be active unless the vehicle was equipped with the factory tow package.

Scott E.
2/13/2017
Still working with no issues.

Larry G.
8/17/2020
Still perfect

Pike H.
8/15/2018
Very happy here. Thank you!
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Pam C.
5/26/2016
Its now been a year since purchasing and installing our hitch and it looks like it did a year ago - new. No quality or performance issues. No wiring issues. We use the hitch frequently for small jobs that require our utility trailer. We still believe that this was a great decision on our part to go with etrailer.