4-Way Flat Trailer Wiring Harness – 25′

4-Way Flat Trailer Wiring Harness – 25′

This 25-foot 4-way flat trailer wiring harness provides a simple and reliable connection for basic trailer lighting functions. Designed for standard 4-flat trailer wiring systems, it carries the circuits needed for running lights, brake lights, turn signals, and ground.

The long 25-foot lead makes it a great choice for wiring utility trailers, small cargo trailers, landscape trailers, and custom trailer builds from the tongue to the rear lighting.

Product Highlights

• Standard 4-way flat trailer-side connector
• 25-foot wiring length
• Supports running lights, brake lights, turn signals, and ground
• Color-coded wires help simplify installation
• Ideal for new trailer builds or complete wiring replacements
• Flexible wiring can be routed along the trailer frame
• Suitable for a wide range of light-duty trailer applications

Common Uses

• Utility trailers
• Landscape trailers
• Small cargo trailers
• Boat trailers
• ATV and motorcycle trailers
• Trailer wiring replacements
• Custom trailer fabrication

Installation: Route the harness securely along the trailer frame and connect each wire to the appropriate lighting circuit. Protect wiring from sharp edges, moving components, and excessive heat, and verify all lighting functions before towing.