Oyviny 4 Pin 5 Wire Trailer Wiring Harness 22FT,Trailer

Oyviny's 22ft 4-pin 5-wire trailer wiring harness is a ready-to-install replacement that routes power to both taillights via a Y-split design for reliable signal, brake and running lights.

If your trailer lights are dim, intermittent or the factory harness is damaged, this Oyviny harness provides a complete 4-way flat plug solution built for routine trailer maintenance and rewiring. It uses 18AWG pure copper conductors inside a durable PVC jacket, with color-coded and pre-stripped pigtails to speed up splicing and reduce installation mistakes. The extra wire and split layout eliminate the need to run a ground or signal wire across the axle, simplifying upgrades on utility, boat, ATV and UTV trailers.

How does the Y-split design simplify trailer rewiring?

The Y-split separates the harness into dedicated left and right taillight runs, so you can install lights on each side without stretching a single wire across the undercarriage. This setup lowers the risk of chafing and improves serviceability.

• Two distinct wire runs to reach both taillights easily
• Reduces wiring across the axle and potential damage points
• Makes future replacements or diagnostics faster

What materials and build features ensure long-term performance?

This harness uses 18AWG pure copper conductors for solid electrical conductivity and a thick PVC jacket to protect against abrasion, UV exposure and moisture. The connector has anti-slip tabs and a rubber dust cap to keep corrosion out when not connected.

• 18AWG pure copper for stable signal and low resistance
• Durable PVC jacket resists wear and weathering
• Ergonomic anti-slip tabs and a dust cover for protection and easier handling

Is the harness easy to install for a DIYer?

Yes—wires are color-coded to match standard trailer functions and come with pre-stripped pigtails to speed splicing into your trailer's existing wiring. At 22 feet, the harness provides generous length to route along frame rails and reach lights on most small-to-medium trailers.

• Color-coded wires for left/right turn, brake and running lights
• Pre-stripped ends reduce prep time and improve connection consistency
• 22ft length fits common trailer sizes without extensions

Will this work with my trailer's 4-way flat connector?

The harness uses a standard 4-pin flat plug that is compatible with most vehicle and trailer 4-way connectors. It is designed for general-purpose trailer lighting, including utility, boat, and ATV/UTV trailers.

• Standard 4-pin flat plug fits typical vehicle receptacles
• Compatible with common trailer lighting setups (running/brake/turn)
• Ideal for replacing worn or corroded factory harnesses

Who is this for: This Oyviny 4-pin 5-wire 22ft harness is aimed at owners and technicians who need a durable, easy-to-install wiring replacement for small-to-medium trailers. It's particularly useful for DIYers, boat owners, landscapers and anyone replacing frayed or undersized factory wiring who wants a neat, long-lasting solution with clear color coding and a split run to each taillight.