Oyviny 4-Pin 5-Wire Trailer Wiring Harness 22FT Y-Harness — Pure Copper with Nylon Sleeve

Oyviny’s 22-foot 4-pin, 5-wire Y-harness is a complete trailer light rewiring kit that supplies pure copper conductors, color-coded leads and a nylon-protected sleeve to restore left and right taillight function without complex splicing.

When a trailer’s taillights or turn signals fail, diagnosing and replacing individual runs can be time-consuming. This Oyviny harness simplifies the job: a wishbone (Y) design carries two brown tail-light leads so both sides illuminate, while color-coded wiring and a 4-way flat plug make it compatible with standard connectors. The assembly uses thick PVC insulation, pure copper cores for better conductivity, and a nylon net sleeve to resist abrasion and weather exposure—ideal for replacing worn harnesses on utility trailers, boat trailers, or campers.

How does this harness simplify rewiring dual taillights?

Rather than running two separate tail-light circuits, the Y-harness splits the tail-light feed into left and right outputs, so both sides receive power simultaneously without additional splices. The kit includes a standard 4-way flat male plug to mate with industry sockets and color-coded wires to match existing trailer wiring quickly.

• Wishbone design delivers two brown tail-light leads for left/right lights
• Color-coded wires (brown, yellow, green, white, etc.) for easy matching
• 4-way flat male connector fits industry-standard sockets
• 22 ft main lead plus 2.5 ft ground for flexible routing

What materials and protections help it last outdoors?

The harness combines pure copper conductors for reliable electrical flow with thick PVC insulation to resist oil, UV and moisture. Additionally, a black nylon net tube surrounds the bundle to reduce abrasion where the cable rubs against trailer frames or fasteners.

• Pure copper wiring for improved conductivity and lower voltage drop
• Thick PVC jacket for corrosion and weather resistance
• Nylon net sleeve guards against chafing on metal edges
• Robust 4-way flat plug built to withstand trailer environments

Will this kit fit my trailer and how long is the cable?

The Oyviny 4-pin 5-wire harness is built to match common 4-way flat sockets used on most trailers. Its 22-foot main cable provides ample reach from the trailer tongue to rear fixtures while an extra 2.5-foot ground lead allows secure chassis attachment without strain.

• 22 ft main harness for long frame runs or routing flexibility
• 2.5 ft dedicated ground wire for secure chassis grounding
• Designed for standard 4-way flat trailer sockets and plugs
• Suitable for replacing damaged factory or aftermarket harnesses

How straightforward is installation for DIYers?

Color-coded wires reduce guesswork and make splicing fast; each function is labeled by color so you can tie into brakelight, turn, tail and ground circuits quickly. Basic tools—wire strippers, connectors and heat shrink or marine-grade tape—are all that’s needed for a neat, dependable connection.

• Color-coded wiring streamlines matching existing circuits
• Splice-ready leads work with butt connectors or solder joints
• Use heat-shrink or marine-grade sealant for waterproofing
• No complex adapters required for 4-way flat systems

Who is this for: The Oyviny 4-pin 5-wire 22FT harness is aimed at DIY trailer owners, small repair shops and fleet managers who need a reliable, easy-to-install replacement for worn or damaged trailer wiring. It suits utility trailers, boat trailers, horse trailers, campers and any application that uses a 4-way flat connector and requires separate left/right tail-light circuits. If you want a long, protected harness with clear color coding and solid copper conductors, this kit is built to make the repair quick and durable.