Ducodden 4-Pin Trailer Wiring Harness for Jeep Wrangler JL/JLU & Gladiator JT 2018–2025 — Plug-and-Play Sealed

Ducodden 56407 is a plug-and-play 4-pin trailer wiring harness that adds a protected, factory-style 4-way connector to compatible Jeep Wrangler JL/JLU and Gladiator JT models so you can tow lights safely and reliably.

If you need a simple, reversible way to connect trailer taillights, brake lights and turn signals to your Jeep, this wiring harness gives you a sealed 4-pin flat connector that plugs into the vehicle’s factory harness. It’s designed for direct compatibility with many 2018–2025 Wrangler JL/JLU and 2020–2025 Gladiator JT models and uses corrosion-resistant contacts and a rubber dust cover to keep the connection working in wet or salty conditions.

Will this harness fit my Jeep Wrangler or Gladiator?

Check the year and model against the listed compatibility: Wrangler JL/JLU 2018–2025 and Gladiator JT 2020–2025. Confirm your vehicle’s OE part numbers (56407 or 118786) if you want exact match assurance. Note that some special trims or EcoDiesel variants may be excluded.

• Compatible: 2018–2025 Jeep Wrangler JL/JLU (2-door and 4-door)
• Compatible: 2020–2025 Jeep Gladiator JT pickup
• Manufacturer part numbers: 56407 and 118786
• Verify exclusion lists (for example, some EcoDiesel models)

How difficult is the installation and do I need to cut wires?

Installation is plug-and-play — there’s no cutting, splicing, or special tools required. The harness mates to the factory connector and supplies a standard rear 4-pin flat plug for trailer lighting. You may need to route the hot lead to your vehicle’s power point depending on your model and towing setup.

• Plugs into factory wiring with no splicing
• Includes 4-way flat trailer connector for taillights, brakes, and signals
• May require running the hot lead up to the vehicle’s fuse or power source
• Reversible installation keeps vehicle wiring intact

What materials and protections does the harness include for durability?

The harness uses corrosion-resistant conductive metals and a protective rubber dust cover over the trailer plug to resist moisture, dirt and salt. Those choices reduce the risk of rust, short circuits and intermittent lighting faults when towing in wet or off-road environments.

• Corrosion-resistant contacts for long electrical life
• Rubber dust cover seals the 4-pin connector when not in use
• Weatherproof design suited for outdoor, trail, and salted-road use
• Factory-style fitment to prevent loose connections

What functions will this harness support for my trailer?

The Ducodden 4-pin harness supplies all standard trailer lighting functions: tail/parking lights, left/right turn signals, and brake lights. It does not provide a dedicated 12V power feed for trailer accessories like interior lights or battery charging without additional wiring or an add-on converter.

• Supports trailer tail, brake and turn signals
• Provides a standard rear 4-pin flat connector
• Not intended for trailer auxiliary 12V power or electric brakes
• Works with factory lighting circuits for synchronized operation

Who is this for: The Ducodden 56407 harness is aimed at Jeep owners who want a clean, OEM-like trailer lighting connection without altering vehicle wiring — ideal for Wrangler JL and Gladiator JT drivers who tow occasionally or frequently and want a durable, weatherproof plug that’s simple to install and remove. If you need auxiliary trailer power or electric brake control, consider supplemental modules or a higher-pin harness.