Gonice 25ft 4-Pin Trailer Wiring Harness Kit with Black Nylon Sleeve, Y-Split for Durability

Gonice 25Ft 4-Pin Trailer Wiring Harness Kit is a ready-to-install Y-style 4-way flat trailer wiring set with a protective black nylon sleeve for long-lasting, weather-resistant connections.

This trailer wiring kit from Gonice supplies a complete 4-pin male flat lead that splits into a Y-harness along the trailer tongue, plus a dedicated ground lead, giving you the length and protections needed to rewire trailers, campers, boats, or utility trailers. Built with color-coded 18 AWG conductors and a black nylon protective sleeve, this kit aims to reduce corrosion and abrasion while keeping installation straightforward for DIYers and professionals alike.

How does this harness simplify trailer rewiring?

The Gonice kit is preassembled as a Y-harness so you can route the main lead down both trailer sides without fabricating splits or splices. Color-coded wires and a standardized 4-way flat connector match common vehicle sockets to minimize guesswork.

• Includes a 25-foot male 4-flat main cable for flexible routing.
• Y-split design reaches both left and right taillights from the tongue.
• Color coding for quick identification of tail, turn, brake, and ground circuits.
• Bonded wiring reduces loose strands and simplifies splicing.

What protective features prevent corrosion and wear?

This harness combines quality conductor insulation with an outer nylon sleeve that shields the cables from chafing, UV, and moisture exposure. The sleeve helps keep connections cleaner longer and protects against road debris and abrasion.

• Black nylon braided sleeve resists abrasion and sunlight degradation.
• Insulated 18 AWG conductors designed for automotive trailer use.
• Factory-assembled plug reduces exposed wire and weak connection points.
• Materials selected for improved corrosion resistance around connectors.

Will it fit my vehicle and trailer setup?

The Gonice harness uses the industry-standard 4-way flat plug, making it compatible with most trucks, SUVs, and towing vehicles equipped with a 4-pin socket. The 25-foot length and extra ground lead give room to route around frames and crossmembers on common trailer types.

• Standard 4-pin flat male connector fits common 4-way flat sockets.
• 25 ft main lead accommodates longer tongues and larger trailers.
• 2.5 ft ground wire for secure chassis grounding attachment.
• Suitable for campers, boats, snowmobile trailers, utility and cargo trailers.

How straightforward is installation for non-professionals?

Installation is intended to be accessible: the color-coded, bonded wires make matching existing trailer circuits simple, and the pre-formed Y-split removes the need to build a split yourself. Basic hand tools, wire connectors, and common splicing methods are all that’s required.

• Color-coded wiring for easy identification and splicing.
• Bonded conductors help keep wires tidy during installation.
• Pre-assembled 4-flat plug avoids pin replacement or soldering at the socket.
• Can be installed with crimp connectors, butt splices, or soldered joints per preference.

Who is this for: The Gonice 25Ft 4-Pin Trailer Wiring Harness Kit is aimed at trailer owners, DIY mechanics, and fleet managers who need a reliable, weather-resistant 4-way flat wiring solution. It’s a good match for anyone replacing a worn harness, upgrading trailer wiring for seasonal use, or outfitting campers, boats, and utility trailers where a durable sleeve and sufficient length improve routing and longevity. This kit does not include breakaway or trailer braking components and is intended for lighting and signal circuits only.