MECMO 55384 USCAR 7-Pin to 4-Pin Trailer Harness | 41-Inch Quick Connect for Tailgate Light Bar

Flexible, universal towing solution for trucks and trailers

The MECMO 55384 replacement USCAR 7-pin to 4-pin trailer harness is designed to bridge power between your vehicle and a tailgate light bar or other 4-prong accessories. At 41 inches, the extension offers room to route wiring neatly while keeping connectors accessible and protected.

This harness can adapt to a variety of towing setups, helping you connect 7-way functionality when needed and 4-pin power for LED bars, without requiring a full rewire. It’s built to be a practical addition for day-to-day reliability and occasional upgrades.

What makes it versatile

• Dual-output design lets you operate 7-pin and 4-pin devices from a single harness, broadening compatibility with trailers and components.
• Long reach of 41 inches reduces strain on connections and allows flexible routing around the hitch area.
• Keeps the 7-pin connection available for your truck’s standard trailer lights while enabling a separate 4-pin circuit.

Plug-and-play installation you can count on

• The T-connector is designed for plug-and-play use, requiring no cutting or splicing of your existing wiring.
• Simply unplug and reconnect to the USCAR socket for a quick upgrade that minimizes downtime.

Durable construction for routine use

• 16 AWG pure copper conductors deliver solid electrical performance under typical towing conditions.
• The 4-pole sockets are protected by a waterproof rubber cap, guarding against moisture and dust.

Ideal scenarios and compatibility

The harness suits many trucks with 7-pin USCAR connectors or factory tow packages. It’s particularly handy for powering LED tailgate light bars, auxiliary lighting, or other 4-prong accessories that sit near the tailgate. While designed to be broadly compatible, always verify your vehicle’s connector type and the trailer’s wiring layout before use.

In practice, this setup can simplify seasonal towing, camping trips, boat launches, and ATV transport by reducing the need for separate adapters and extra wiring. It offers a practical upgrade path for drivers seeking flexibility without major installation work.