WALSIO 4 Pin 5 Wire Trailer Wiring Harness – 22ft, 4-Way Flat Connector for Tail Lights

Overview

Introducing the WALSIO 4 Pin 5 Wire Trailer Wiring Harness, a compact kit built to simplify trailer electrical connections. The five-wire design covers the essentials for tail lights, brake lights, and turn signals, reducing the need for extra splices and extensions. This versatile harness is designed to adapt to a range of trailer sizes while keeping the wiring neat and organized.

Durable, Weather-Ready Construction

Quality matters when you’re on the road or at the marina. The harness uses 18 AWG pure copper conductors, a thick PVC coating, and a rugged black braided nylon mesh outer layer. The waterproof and dustproof end cap helps protect the connection from rain, splashes, and dust, supporting reliable performance in diverse conditions.

Color-Coded for Easy Installation

Whether you’re a seasoned installer or a first-timer, color-coded wires align with standard 4-way flat sockets, making it simpler to match functions and reduce guesswork. The kit includes a male plug to replace worn wiring on many trailers, so you can upgrade without a full rewiring project.

Y-Harness Design for Cleaner Routing

The front-mounted Y-harness splits from the trailer sides, eliminating the need to route a wire across the axle. This thoughtful configuration helps you keep wiring tidy and reduces potential snag points during hitching and driving.

Length, Compatibility, and Versatility

With 22 feet of overall length and a 2.5-foot ground wire, you gain flexible routing for longer trailers. It’s suitable for marine boat trailers, horse trailers, ATVs, and other trailers using a 4-way connector.

What You Get and Practical Benefits

• 4 Pin 5 Wire setup to cover the required signals without extra splices
• 22 ft of wire and a 2.5 ft ground lead for adaptable installation
• 18 AWG copper conductors with thick PVC coating for safety and durability
• Waterproof and dustproof protection for weather-resilient performance
• Color-coded wires matched to industry standards for speed and accuracy
• Y-Harness front design to simplify routing around the axle

Note: The kit is designed for straightforward upgrades and connects to common 4-way sockets found on many trailers. It offers practical options for improving lighting reliability without making guarantees.

Real-Life Use Case Ideas

Picture towing a boat or equipment trailer on a sunny day. The harness stays neatly tucked behind the tongue, while the lights respond consistently as you maneuver into a launch ramp or parking spot. The robust build is intended to endure outdoor conditions over time.