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This harness plugs inline with the vehicle’s tail light wiring, so you don’t have to cut or splice anything. The connectors match the factory plugs, making setup quick and clean. Once connected, you get a standard 4-flat trailer plug ready for running lights, turn signals, and brake lights.
The integrated converter isolates the trailer wiring from the vehicle’s lighting circuits. It keeps the load balanced and protects sensitive electronics if there’s a short or overload on the trailer side. The harness is rated for 2.1 amps maximum per side for stop/turn lights and 4.2 amps total for running lights, enough to power typical small-trailer lighting systems safely.
A good ground makes all the difference in trailer lighting performance. This harness includes a dedicated ground wire designed to be attached to a clean, bare metal surface for reliable current flow. That solid connection helps prevent flickering lights and intermittent signal loss during towing.
Once installed, the 4-flat connector provides the essential lighting functions most trailers use—running lights, left and right turn signals, and brake lights. It’s a simple setup that works with standard trailer wiring for dependable visibility every time you tow.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
James H.
10/8/2019
It is still working perfectly. I dont anticipate any problems.
Patrick B.
10/2/2013
Glad to hear the harness worked out well for you. We do have some adjustable coupler systems that utilize channels welded to the front of the trailer. Rather than throw parts at you, we will be in touch so we can figure what you have and what you need. In the meantime, it would be a good idea to snap some photos of the channel and have them ready.
George P.
10/1/2014
Works fine, no problems at all.Wish I would have found it sooner. Thank you.
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Gary G.
4/11/2015
Still works like new , No problems