4-Pin Trailer Plug & Play Tow Hitch Wiring Harness for Jeep Wrangler

In this review the LAIKOU 4-pin trailer wiring harness is examined for Jeep Wrangler JL and JLU models from 2018 to 2024, and the verdict is straightforward: it is a practical, no-frills solution for owners who need a reliable 4-way trailer connection. The biggest reason to buy is the plug-n-play simplicity that lets users hook trailer lights to factory tail lights without cutting factory wiring, making it a good match for owners who tow occasionally and want a tidy, protected harness.

Key Features

• Vehicle compatibility: Specifically designed for Jeep Wrangler JL and JLU 2018-2024, including 2-door, 4-door, 4xe, Rubicon 392 and diesel models, ensuring a tailored fit for these models.
• Durable materials: Constructed from brass, plastic and rubber with tin-plated terminals for reliable conductivity and longer-term electrical contact.
• Weather protection: A harness tube covers the wiring to shield it from dust and water, reducing the risk of rust and short circuits on trailers.
• Plug-n-play setup: The harness connects to factory tail lights with a 4-way output so taillights, turn signals and brake lights operate correctly on the trailer.
• Installation guidance: Color-coded wiring and a clear routing approach make it straightforward to run the yellow wire to the driver side, green to passenger side and power to the battery.
• Included accessories: The kit ships with cable ties and a 12-month warranty, simplifying mounting and offering basic after-purchase support.

Who It's For

This harness is ideal for Jeep owners who want a clean, factory-friendly trailer connection without permanent modifications; it fits JL/JLU models and special trims like 4xe and Rubicon 392, so it suits a broad range of Wrangler drivers. DIYers who prefer plug-n-play solutions will appreciate the straightforward wiring instructions and included zip ties for a tidy install.

It is less appropriate for users who need a heavy-duty, multi-function towing harness with additional features like integrated battery charging or 7-way outputs; those require more complex systems. Also, a few buyers reported mixed fit results, so owners with heavily modified rear bumpers should verify fit before assuming perfect compatibility.

Pros & Cons

Pros

• Easy plug-n-play installation that avoids cutting factory wiring for most JL/JLU vehicles.
• Good material choices and tin-plated terminals for dependable electrical contact.
• Harness tube offers meaningful protection from dust and water for long-term use.
• Includes cable ties and a 12-month warranty for added value and support.

Cons

• Fit is mixed for some users with nonstandard rear setups, so confirm clearance near the hitch and exhaust.
• Only provides a 4-pin output, so it will not support trailer functions that need a 7-way connector or additional power circuits.

Specifications

Product type	4-pin trailer wiring harness
Vehicle fit	Jeep Wrangler JL JLU 2018-2024 (2-door and 4-door, incl. 4xe, Rubicon 392, diesel)
Materials	Brass, plastic, rubber with tin-plated terminals
Output connector	4-way flat plug
Protection	Harness tube for dust and water resistance
Package includes	Wiring harness assembly and cable zip ties
Warranty	12 months

Our Verdict

The LAIKOU 4-pin plug-n-play harness is a sensible, cost-effective choice for Wrangler JL and JLU owners who need a reliable trailer light connection without modifying factory wiring. Its durable construction and protective harness tube make it a practical value for occasional towing, though those needing expanded towing functions or guaranteed fit behind modified bumpers should consider more feature-rich or vehicle-specific options.

Frequently Asked Questions

Will this fit my 2019 Jeep Wrangler JL?
Yes, the harness is designed for 2018-2024 JL and JLU models, including 2019, but check clearance if your bumper or hitch is modified.

Does it require cutting factory wires?
No, it is a plug-n-play harness intended to connect to factory tail light connectors without cutting stock wiring.

Does it include a 7-way adapter?
No, this product provides a 4-way flat output only; users needing a 7-way should purchase a separate adapter or a different harness.