Aufind 35FT 4 Pin 5 Wire Trailer Wiring Harness

Aufind 35FT 4-pin 5-wire trailer wiring harness is a complete color-coded 18 AWG kit that connects tail, brake and turn lights with a durable, weather-resistant jacket and a 35-foot main lead for easy installation.

This wiring harness bundle is built to simplify trailer rewiring and ensure reliable signal and ground paths between your tow vehicle and trailer lights. Constructed from pure copper 18 AWG conductors, a thick PVC jacket and an outer braided nylon sleeve, the kit balances conductivity, flexibility and abrasion resistance for outdoor use. It includes a 35-foot male 4-flat lead, a 2.5-foot ground/return branch, a Y-harness connector, mounting clips and sealed connectors so you can complete most common trailer lighting jobs without hunting down extra parts.

How does this harness make trailer light wiring easier?

The harness uses 5 wires with standardized color coding so you can match signals quickly and avoid guesswork. The included Y-harness and mounting clips reduce splicing and let you secure the cable along the frame for a tidy installation. Solder-seal and plastic connectors are provided to protect splices from moisture and vibration.

• Color-coded wires for signal clarity and faster hookups
• 35 ft main lead and 2.5 ft ground branch for flexible routing
• Y-harness connector reduces on-frame splices
• Sealed connectors and frame clips included for water resistance and neat routing

What materials and construction improve longevity?

The conductors are 18 AWG pure copper for consistent electrical performance and low resistance. Over the core wires sits a thickened PVC insulation that resists oil, salt and UV exposure, while an outer braided nylon mesh defends against abrasion and chafing where the line contacts trailer edges. These layers together deliver a harness intended to withstand marine and road conditions better than bare-jacketed wire alone.

• 18 AWG pure copper for reliable signal transfer
• Thick PVC insulation resists weather and chemicals
• Nylon braided sleeve for abrasion protection
• Weatherproof connectors to guard splices and terminals

Which trailers and vehicles is this compatible with?

This 4-pin flat male connector harness is designed for trailers and tow vehicles that use a standard 4-way flat plug. It fits many boat trailers, ATV trailers, utility and cargo trailers that require tail, brake and turn signal wiring. Note: this kit is not for motorcycle trailers and is not compatible with 7-way or specialty connectors without adapters.

• Ideal for boat, ATV, utility and cargo trailers
• Designed for vehicles with a standard 4-way flat socket
• Not compatible with motorcycle trailers or 7-way plugs without adapters
• Includes components for most common rewiring projects

Who is this for? If you need a dependable, long-length replacement or upgrade for trailer lighting—whether rewiring a tired cable run, equipping a new trailer frame, or preparing a boat trailer for seasonal use—this Aufind 35FT harness delivers the length, connectors and protective layering professionals and hobbyists expect. It’s geared toward DIYers, fleet maintenance techs and trailer owners who want a weather-resistant, easy-to-route wiring solution that reduces on-frame splicing and keeps signal pathways clear. For non-standard electrical systems, confirm plug type and wiring layout before purchase.