WALSIO 26FT 4 Pin 5 Wire Trailer Wiring Harness with PVC

This WALSIO harness delivers five fully insulated 18 AWG copper conductors inside a thick PVC jacket and includes a PVC protective tube and waterproof covers for connectors. The 26-foot overall length with a 2.5-foot ground lead provides flexible routing options, while the Y-harness layout avoids running wires across the axle. Designed to fit industry-standard 4-way flat sockets, it works with boat trailers, horse trailers, utility trailers, ATV trailers and many other light- to medium-duty applications.

How does this harness simplify trailer wiring and replacement?

The harness arrives pre-assembled with five color-coded wires and a male 4-pin flat connector so it replaces worn or damaged wiring without splicing multiple cables. The included PVC protective tube organizes and shields the wires, reducing installation time and preventing abrasion against the frame.

• Pre-terminated male 4-way flat plug for direct connection
• Five conductors eliminate the need for extra extensions
• PVC tube keeps wires bundled and protected from chafing
• Weatherproof plug covers for reliable outdoor use

What materials and construction ensure long-term performance?

WALSIO uses 18 AWG pure copper for each conductor, chosen for its balance of flexibility and electrical conductivity. The thickened PVC outer coating and separate PVC protective tube provide insulation, moisture resistance and mechanical protection to withstand typical road and marine conditions.

• 18 AWG pure copper wires for stable signal and low resistance
• Thick PVC jacket for corrosion and abrasion resistance
• Waterproof dust covers on plugs to block moisture and debris
• Durable terminals and strain-relief where wires meet the plug

Will the 26-foot length and Y-harness shape fit my trailer layout?

The generous 26-foot lead lets you route cable along frame rails and around components without needing extensions; the 2.5-foot ground lead offers additional reach for chassis attachment. The Y-harness splits near the front, so you can route left and right tail light wires down each side without crossing the axle.

• 26ft total length for flexible routing on most trailers
• 2.5ft separate ground wire for easy chassis grounding
• Y-shaped split reduces wiring across the axle
• Sized to fit trailers up to and beyond 80 inches wide

How easy is installation for a DIYer or a mechanic?

Installation is straightforward: the plug connects to any 4-way flat receptacle and the color-coded wires attach to standard trailer light points. The protective tube and labeled conductors make it accessible for users with basic wiring knowledge and quick for experienced mechanics.

• Color-coded wires match common trailer wiring schemes
• PVC covers and tube simplify routing and protection steps
• No special tools required beyond standard hand tools
• Clear replacement for worn or damaged 4-way connectors

Who is this for: The WALSIO 26FT 4-pin 5-wire harness is ideal for owners of boat, utility, ATV, horse and small equipment trailers who need a robust, weather-resistant replacement or an upgrade to simplify wiring layout. It suits DIY installers and professional shops that want a reliable, corrosion-resistant wiring solution compatible with industry-standard 4-way flat systems.