Oyviny Trailer Wiring Harness 4‑Pin 5‑Wire Y‑Split 22ft — Pure Copper with Nylon Net Protection

Oyviny's 22ft 4-pin 5-wire trailer wiring harness is a Y-style rewiring kit that powers left and right taillights, turn signals, and brakes using pure copper conductors protected by a nylon net sleeve.

This trailer wiring harness is built for straightforward replacement or upgrade of a standard 4-way flat connector. It combines a wishbone (Y) layout that splits the taillight circuit into two brown leads, full color-coded wiring for quick splicing, and a long 22‑foot main run plus a separate ground lead. Thick PVC insulation and a braided nylon protective tube guard the copper wires from abrasion and corrosion while keeping installation tidy.

How does this harness simplify trailer taillight rewiring?

Instead of running separate wires or splicing to create dual taillight feeds, the Y-harness design carries a single input that splits cleanly to both taillight circuits. Color-coded conductors match industry wiring standards so you can identify functions fast. The 22ft length gives room to route the cable along trailer frames without tension.

• Y-shaped wishbone layout sends the brown lead to left and right taillights simultaneously
• Color-coded wires for brake, turn, tail and ground reduce wiring errors
• 22 feet of main cable and a 2.5‑foot ground allow flexible routing

What materials and protection keep the wiring durable?

The harness uses pure copper conductors for reliable electrical flow and thicker PVC jackets for weather and abrasion resistance. Around the bundle is a black nylon net tube that adds another layer of mechanical protection and helps prevent chafing during vibration. Terminals and the 4‑flat plug are made to fit standard trailer sockets for a secure connection.

• Pure copper conductors for consistent conductivity
• Thick PVC insulation resists moisture and corrosion
• Nylon net tube prevents rubbing and bundles cables neatly

Will this fit my trailer and vehicle setup?

The male 4‑flat connector matches industry-standard 4-way flat sockets found on most trucks and trailers, making it broadly compatible as a replacement or upgrade. The harness is intended for trailers that use a 4‑pin/4‑way system but need a split taillight feed. It’s not for trailers requiring stop/turn separation beyond the 4‑way convention or for 7‑pin applications.

• Male 4‑flat plug fits standard 4-way trailer sockets
• Designed for trailers needing left/right taillight split without extra splices
• Not compatible with 7-pin or RV-specific multi-function plugs

How easy is installation for DIYers?

Color-coded wires and the ready-made plug make the harness installation approachable for anyone familiar with basic trailer wiring. Simply splice each colored conductor into your existing trailer leads or mount using common connectors and secure the ground. The generous cable length removes the need to extend wires or create tight joins.

• Color coding speeds identification: brown for taillights, etc.
• Pre-assembled plug eliminates soldering the trailer connector
• Long runs reduce need for additional splices or extensions

Who is this for: The Oyviny 4-pin 5-wire 22FT trailer wiring harness is for DIY trailer owners, small-fleet operators, and repair shops replacing worn 4‑flat connections or upgrading a single-feed tail circuit to feed both sides. Choose this harness if you want a long, protected cable assembly with pure copper conductors, clear color coding for fast hookups, and a Y-style split to power left and right taillights without complicated rewiring.