WALSIO 26ft 4-Pin 5-Wire Trailer Wiring Harness Y-Split with PVC Jacket — Weatherproof, 18 AWG Copper

The WALSIO 26FT 4 Pin 5 Wire Trailer Wiring Harness is a weatherproof Y-shaped trailer connector kit with a 26-foot lead and PVC-protected 18 AWG copper conductors for easy, reliable trailer rewiring.

If you need a straightforward replacement or an upgrade for a trailer's 4-way flat hookup, this WALSIO harness supplies an extended run, extra grounding wire and a protective PVC jacket to resist moisture and abrasion. Built to fit most 4-pin flat sockets, the kit simplifies installation with a Y-split design that avoids running a wire across the axle and gives enough length for boat, horse, ATV and utility trailers.

How does the Y-shaped design simplify trailer wiring?

The Y-harness divides the wiring at the front of the trailer so you don't have to route a conductor across the axle. That reduces pinch points and makes routing around suspension components easier, cutting installation time and lowering risk of damage.

• Front-mounted Y split avoids axle crossing and simplifies routing.
• Two branch runs let you reach both sides of the trailer without extensions.
• Reduces exposure to moving parts and potential chafing points.

What materials and construction protect this harness outdoors?

This harness uses 18 AWG pure copper conductors with a thick PVC outer coating and sealed plug covers to resist water and dirt. The heavier PVC jacket increases abrasion resistance and the dustproof covers keep contacts cleaner for longer life in marine or road environments.

• 18 AWG pure copper wires for consistent conductivity.
• Thickened PVC jacket for abrasion and moisture protection.
• Waterproof/dustproof plug covers to protect electrical contacts.

Will the length and wiring layout fit my trailer type?

With a 26-foot overall length and an additional 2.5-foot ground lead, the harness accommodates small and larger trailers without needing splices. It's compatible with most trailers using a 4-way flat connector and suits marine, ATV, horse and utility trailers.

• 26ft main length for flexible routing and rewiring options.
• 2.5ft ground lead for secure chassis grounding placement.
• Designed to match industry-standard 4-way flat sockets for easy swap-in.

How easy is it to install if I'm not an electrician?

The PVC-protected wires are color-coded and sized to work with standard 4-pin flat connectors, making installation accessible for DIYers. Basic tools and a few mounting decisions are all that's required to replace a worn harness or add a new Y-split to an existing trailer.

• Color-coded 5-wire layout simplifies identifying brake, turn and ground circuits.
• PVC jacket keeps wires manageable while you route and secure them.
• Plug-ready male 4-way flat connector fits common trailer sockets without special adapters.

Who is this for? The WALSIO 26FT 4 Pin 5 Wire Trailer Wiring Harness is aimed at trailer owners, boaters, equestrians and small-fleet operators who need a durable, weather-resistant replacement or retrofit harness. It suits DIY installers and service shops looking for a ready-made Y-harness that reduces wiring complexity, protects conductors from the elements, and gives extra length for flexible routing on trailers up to and beyond 80 inches wide.