Gonice 25ft 4‑Pin Trailer Wiring Harness Kit — Black Nylon Sleeve, 5‑Wire Y‑Harness for Durable Weather‑Resistant Connections

The Gonice 25ft 4‑pin trailer wiring harness kit is a weather‑resistant Y‑harness with a black nylon protective sleeve and a 4‑pin/5‑wire plug designed for easy, long‑lasting trailer wiring connections.

This complete wiring harness replaces or extends factory trailer wiring to restore tail lights, turn signals and ground connections. Built with color‑coded 18 AWG conductors and a bonded design, the kit’s 25 foot lead and 2.5 foot ground give you room to route wires along the trailer tongue, with the black nylon sleeve shielding cables from abrasion, UV and moisture.

How does this harness make installation simpler?

The Gonice harness arrives color coded and pre‑bonded so you can quickly identify circuits and splice into existing wiring without complex troubleshooting. The 4‑way flat plug fits standard trailers and the Y‑split runs down both sides of the tongue to reach left and right tail lights.

• Color‑coded 18 AWG wires for easy identification.
• Pre‑bonded cable reduces loose wires and tangles.
• Standard 4‑pin flat connector for universal compatibility.
• Y‑harness layout streamlines routing to both light clusters.

Will this hold up to outdoor conditions and heavy use?

The harness uses corrosion‑resistant materials and a durable black nylon protective sleeve to defend against abrasion, water and sun exposure. Those features extend service life compared to bare or unprotected replacement wires, particularly in marine, snow or heavy‑haul environments.

• Nylon sleeve for abrasion and UV resistance.
• Corrosion‑resistant conductors and connectors.
• Robust plug housing to prevent moisture intrusion.

What vehicles and trailers is this compatible with?

This 4‑pin flat harness is compatible with most light‑duty trailers, campers, utility trailers, small boats and many RVs that use a standard 4‑way connector. The supplied length and ground lead allow flexible placement on tongue‑mounted and frame‑mounted wiring runs.

• Fits standard 4‑way flat trailer sockets on trucks and SUVs.
• Suitable for utility, cargo, boat, snowmobile and small RV trailers.
• 25 ft main cable and 2.5 ft ground for varied trailer layouts.

How do I maintain this harness for long life?

Keep connector contacts clean and periodically inspect the nylon sleeve for cuts or abrasions. Apply dielectric grease to the plug before storage and check splices for corrosion after winter or heavy marine use.

• Inspect connectors and sleeve at least twice per season.
• Use dielectric grease to reduce oxidation on contacts.
• Repair or replace damaged sections promptly to prevent shorts.

Who is this for: The Gonice 25ft 4‑pin trailer wiring harness kit is aimed at DIYers, fleet operators and trailer owners who need a straightforward, rugged replacement or upgrade for broken or worn trailer wiring. It’s a good match if you want an easy splice‑in installation, extra cable length for routing, and added protection from abrasion and weather without a complex electronics installation.