Oyviny 4-Way Flat Trailer Wiring Harness Coiled 10.5 ft — PU Jacket, Pure Copper, Color-Coded

Oyviny’s 4-way flat coiled trailer wiring harness is a 10.5-foot, stretchable 4‑pin extension with color-coded pure copper conductors and a durable PU jacket for reliable taillight, brake and turn-signal connections.

This coiled 4‑pin trailer extension by Oyviny replaces or extends standard 4‑way flat connections between a tow vehicle and trailer. Designed to match industry standard 4‑way flat sockets, the harness offers a compact coiled form that stretches when you need extra reach and retracts to avoid dragging or catching. Heavy-gauge pure copper conductors and a polyurethane (PU) jacket provide improved wear and temperature resistance compared with ordinary PVC sheathing, making it suitable for a variety of trailer types.

How does the coiled design help when towing?

The coiled shape keeps excess cable out of the way when the trailer and vehicle are close, then extends smoothly when you need more length. That reduces snagging, road abrasion, and exposure to hazards beneath the trailer while still giving you flexibility at turns and hitching points.

• Designed length 10.5 ft (126 in); normal working length about 9.5 ft (114 in)
• Stretches for tight turns or longer separations between vehicle and trailer
• Retracts to prevent dragging and road wear

Will this harness fit my trailer and vehicle?

The Oyviny harness uses the standard 4‑way flat connector common on many trailers, boats, ATVs and motorcycle trailers, so it plugs directly into most 4‑way sockets. Color‑coded wires allow straightforward splicing to existing trailer wiring for taillights, brake lights and signals.

• Standard 4‑pin flat male plug matches industry sockets
• Color-coded conductors simplify installation
• Works with boat trailers, utility trailers, ATV and motorcycle trailers

What materials and construction ensure durability?

Oyviny builds this extension from pure copper wires for solid conductivity and a PU (polyurethane) jacket that resists abrasion and temperature extremes better than PVC. The combination helps maintain signal integrity and extends service life under regular towing conditions.

• Pure copper internal conductors for reliable electrical flow
• PU jacket for superior wear and temperature resistance
• Coiled design reduces exposure to road hazards

How do I install and maintain the harness?

Installation is straightforward: plug the male 4‑pin into the vehicle socket and splice color-coded wires into the trailer’s wiring as needed. Routine inspection and keeping connectors clean and dry will prolong lifespan; replace if you see broken conductors or severe jacket abrasion.

• Plug into vehicle 4‑way flat socket or splice into trailer wiring
• Match the color-coded wires to existing circuits for lights and signals
• Inspect connectors and jacket for damage before each trip

Who is this for: The Oyviny 4‑way coiled trailer wiring harness suits DIY trailer owners, boaters, and anyone who needs a compact, stretchable 4‑pin extension that resists wear. It’s a practical replacement for worn or damaged 4‑way cables and a smart choice when you want an extra-long, retractable lead that keeps wiring off the road and out of harm’s way.