FZSFVAQ 25ft Trailer Wiring Harness Kit — 4 Pin 5-Wire Boat Trailer

Upgrade Your Trailer Lighting with the FZSFVAQ 25ft Trailer Wiring Harness Kit

Designed for boat trailers and other towed units, the FZSFVAQ 25-foot wiring harness provides a clean, reliable path for tail lights, brake lights, and turn signals. The result is a system that can be trusted when you’re on the road or at the boat ramp, with careful attention to ease, durability, and compatibility.

Simple, Color-Coded Installation

The core of the kit is a five-conductor wiring arrangement that uses clear color-coding and labeled leads. This makes connecting running lights, brake signals, and turn indicators simpler—reducing guesswork and speeding up the process for both newcomers and seasoned DIYers.

• 5 labeled wires map each function: tail, brake, left turn, right turn, and ground.
• Y-shaped harness connector enables branching from different trailer sides for flexible routing.

All-Weather Durability You Can Feel

Rugged construction is built to stand up to sun, rain, road salts, and dirt. Thick PVC-coated wires resist corrosion and abrasion, while a black nylon mesh sleeve adds a protective layer. A waterproof/dustproof plug cover seals the connection point for reliable performance in challenging conditions.

• Thick PVC insulation and nylon mesh protection.
• Waterproof plug cover guards the connection against dust and moisture.

Plenty of Reach, Smart Grounding

The kit includes a generous 25-foot main 4-pin, 5-conductor cable, plus a 2.5-foot bonded ground wire. That combination provides ample length to reach the vehicle socket and create a solid ground path, even on longer trailers or awkward installations.

• 25 ft main cable plus 2.5 ft grounding wire.
• Flexible routing for complex trailer setups.

Universal Compatibility for Quick Replacement

The male 4-way flat connector is designed to fit most standard sockets. If you’re replacing worn or damaged wiring, this kit offers a straightforward, plug-and-play option that minimizes downtime and keeps vehicles ready for the road.

• Universal 4-way flat compatibility with many trailers.
• Plug-and-play design reduces install time.

What’s Included and How It Helps

Beyond the core harness, the kit offers practical benefits you can count on—from clean routing options to a weather-ready build that stays reliable in less-than-ideal weather. The result is a versatile wiring solution suitable for boat trailers and other light-duty towing needs.