Curt Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2026 Lexus RX 450h Plus
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2026 Lexus RX 450h Plus
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This Curt Vehicle Wiring Harness with 4-Pole Flat Trailer Connector gives you the basic lighting functions—tail, brake, and turn signals—through a single 4-way plug. It’s a straightforward way to make your trailer lights work in sync with your tow vehicle so you can stay visible and safe on the road.
Instead of hunting for an adapter or dealing with mismatched plugs, this harness splices directly into the vehicle’s existing wiring. The color-coded wires match standard trailer functions—brown for running lights, green for right turn, yellow for left turn, and white for ground—so it’s easy to follow and connect. Once wired in, it provides a solid, long-lasting link between vehicle and trailer.
The harness can be tied into the wiring along the driver-side frame rail or behind the rear bumper. That gives you flexibility during installation and helps keep the wiring tucked out of sight and protected from road debris. It’s a simple solution that keeps things neat while still being easy to reach when you need to plug in your trailer.
Whether you’re hauling a small utility trailer, boat, or camper, this harness provides consistent signal transfer every time you hook up. It works well with standard trailer wiring setups that use a 4-flat connector, making it an easy fit for light-duty towing jobs without any extra converters or adapters.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Tom K.
7/13/2019
Still running strong
William N.
7/6/2016
No issues. All is great.
Do you have a question about this Custom Fit Vehicle Wiring?
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Sierra K.
9/3/2021
I know that you are hesitant about the install of your wiring. This is a factory replacement so the wires you need should be along the drivers-side frame rail or behind the rear bumper. I would use a circuit tester to test for functions because sometimes the wires are different colors than what comes in this kit. Usually, the bigger white wire is the ground. The quick splice connectors are quite handy and relatively easy to use.