CURT Custom Wiring Connector 4-Way Flat 56420 — Vehicle-Specific Plug-and-Play for Hyundai & Kia Dust Cover

The CURT 56420 custom wiring connector is a vehicle-specific plug-and-play T-connector that provides a 4-way flat trailer socket without cutting or splicing your factory wiring.

If you tow occasionally or frequently, adding a reliable trailer wiring socket should be simple and reversible. The CURT 56420 is made to fit select Hyundai and Kia models and uses an OEM-compatible plug to create a standard 4-way flat output that powers tail lights, brake lights and turn signals. It includes the mounting hardware and a dust cover so the connector stays clean when not in use.

Which vehicles does this CURT harness fit?

This connector is designed as a custom-fit T-connector for specific model years of Hyundai Palisade, Hyundai Santa Fe, Hyundai Tucson, Kia Telluride and Kia Carnival. Always confirm fitment with the product application info for exact years and trims before ordering.

• Made for particular Hyundai and Kia models—vehicle-specific fit.
• Check the application guide or VIN lookup for compatibility.
• No universal splicing needed when matched to the correct vehicle.

How does it install and what tools are required?

Installation is plug-and-play: the connector mates with the vehicle's OEM socket and creates a 4-way flat trailer outlet instantly. There’s no cutting, splicing, or soldering, so most installs are quick and can be completed with minimal tools.

• Plug into the factory wiring socket—no vehicle wiring modification.
• Includes hardware for secure mounting of the connector socket.
• Typical install time: short; basic hand tools like a trim tool or socket set may be helpful.

What features improve durability and compatibility?

The CURT 56420 uses SMT (surface-mount technology) circuitry and a built-in tail light converter to ensure reliable signal translation between the vehicle and trailer lighting. A dust cover helps protect the connector when it’s not in use.

• SMT circuitry for consistent electrical performance and long life.
• Tail light converter ensures correct signal for many vehicle lighting systems.
• Dust cover keeps pins clean and prevents corrosion when stored.

What signals and trailers are supported by the 4-way flat socket?

The standard 4-way flat output supplies running lights, left and right turn signals, and brake lights—sufficient for basic trailers, small boats, cargo trailers and utility trailers that do not require battery charge or reverse/auxiliary functions.

• Provides tail, stop, and turn signal circuits for most small-to-medium trailers.
• Not intended for trailers needing 7-way functions such as trailer brake output or constant power.
• Use with compatible 4-flat trailer plugs for immediate connection.

Who this is for: Drivers of compatible Hyundai and Kia vehicles who want a clean, reversible wiring solution for towing without modifying factory harnesses. It’s ideal for owners who tow light trailers, boats, ATVs or campers and prefer a reliable OEM-style connection that installs quickly and stays protected with included hardware and a dust cover.