Oyviny 4-Pin Trailer Wiring Harness for Jeep Wrangler JL/JLU & Gladiator JT (2018–2025) — Pure Copper, Sealed Converter

Oyviny 56407 is a plug-and-play 4-pin trailer wiring harness engineered to connect your 2018–2025 Jeep Wrangler (JL/JLU) or 2020–2025 Jeep Gladiator (JT) to trailer lighting using 100% pure copper conductors and a sealed, durable converter.

This harness provides a straightforward, OEM-style electrical interface between your Jeep and a small trailer, boat, ATV carrier, or camper. Designed to match factory sockets on Sahara, Sport, Rubicon and Unlimited variants, the harness routes tail, stop, and turn signals from the vehicle to the trailer through a standard flat four-pin connector. The assembly uses corrosion-resistant materials and a surface-mount converter to maintain bright, reliable trailer lighting with minimal heat generation.

How simple is installation on my Jeep Wrangler or Gladiator?

Installation is intended to be quick and tool-minimal: the harness plugs into existing vehicle sockets without cutting, splicing, or tapping into factory wiring. It’s a true plug-and-play option for owners who want a clean, reversible installation.

• Direct-fit connectors match OEM trailer wiring ports
• No wiring modification required for compatible Jeep models
• Included dust caps protect unused plugs from moisture and dirt

Which lighting functions does the 4-pin connector support?

The 4-pin flat connector carries essential lighting circuits only — tail/running lights, left and right turn signals, and brake lights. It’s the standard solution for most small trailers and utility loads that do not require auxiliary power or electric brakes.

• Tail/running lights and illumination
• Brake light output synchronized with vehicle brakes
• Separate left and right turn signal circuits

What materials and technologies are used to ensure durability?

Oyviny builds the harness with robust, weather-resistant components: ABS housings, sealed epoxy for the converter, and 100% pure copper wiring for low-resistance electrical paths. Surface-mount technology in the converter helps maintain light intensity while dissipating minimal heat.

• Pure copper conductors for consistent conductivity
• ABS and sealed enclosures for corrosion and moisture protection
• Dust covers on the plug and fuse holder to keep contacts clean

Will this harness work with my trailer type and towing needs?

The 4-pin format is compatible with a broad range of small towables including boat trailers, ATV trailers, utility trailers, and small campers. If your trailer requires battery charging, reverse lamps, or electric brakes, you’ll need a 6- or 7-pin solution instead.

• Ideal for boat, ATV, utility trailers and small campers
• Not intended for trailers needing electric brake control or 12V power feed
• Meets common towing lighting needs for everyday hauling

Who is this for: The Oyviny 56407 harness suits Jeep owners who tow small trailers and want a reliable, factory-compatible connection without modifying their vehicle wiring. It's geared toward drivers of 2018–2025 Jeep Wrangler JL/JLU (2- and 4-door variants, including Sahara, Sport, Rubicon and Unlimited trims) and 2020–2025 Gladiator JT models seeking straightforward installation, corrosion resistance, and stable trailer lighting performance for routine towing tasks.