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

The Oyviny 4-way flat coiled trailer wiring harness is a 10.5-foot, stretchable 4-pin extension with color-coded pure copper conductors and a PU jacket built to replace or extend standard 4-way trailer connections.

If you tow small trailers, boats, ATVs, or motorcycle trailers, a reliable 4-way flat connection is essential for lights and signals. This Oyviny harness supplies a male 4-pin plug, a springy coiled cable that stretches when you need room and retracts to avoid dragging, plus durable materials designed to stand up to outdoor exposure and regular towing use.

How does this harness make towing simpler?

The coiled design keeps excess cable off the ground and avoids tangles while still providing plenty of reach when you need it. Stretching to connect longer couplers or larger tow distances, it retracts for compact storage and fewer snags during travel.

• 10.5-foot designed length (approx. 9.5 ft working) for flexible reach
• Coiled cable prevents dragging and reduces strain on connectors
• Male 4-way flat plug fits industry-standard vehicle sockets

Will it work with my trailer’s lights and signals?

Yes — the harness uses the standard 4-way flat wiring format, so it connects taillights, turn signals and brake lights with a simple splice or plug-in. Color-coded conductors make matching wires fast and reduce installation errors.

• Standard 4-pin configuration for tail, left/right turn and ground
• Color-coded wires for quick identification and splicing
• Male plug designed to mate with common 4-way flat vehicle sockets

Is the cable durable enough for outdoor towing?

This Oyviny harness is built with pure copper conductors and a polyurethane (PU) outer jacket instead of PVC, giving improved wear and temperature resistance for real-world conditions. The construction is intended to protect the wiring from abrasion, moisture and road debris encountered when towing.

• Pure copper wires for reliable electrical conductivity
• PU jacket resists abrasion, temperature changes and weather better than PVC
• Rugged connectors designed for frequent coupling and uncoupling

What trailers and setups is this best suited for?

The harness is sized and wired for small to medium trailers that use the conventional 4-way flat connector system. It’s useful as a replacement for worn plugs, an extension when you need extra reach, or a tidy coiled option for tow vehicles that frequently connect and disconnect trailers.

• Boat trailers, ATV trailers, motorcycle trailers, small utility trailers
• Works as replacement plug or extension cable for existing 4-way systems
• Provides extra length for flexible, safe wiring routing

Who is this for: This Oyviny 4-way coiled harness is designed for vehicle owners, DIY trailer hobbyists, fleet operators, and anyone who needs a tidy, stretchable 4-pin connection for towing. If you want a straightforward, color-coded 4-way plug with improved jacket durability and a coiled cable that reduces dragging and clutter, this harness is a practical option for routine towing and trailer maintenance.