CURT 4-Way Trailer Wiring Harness for Ford E-Series (E-150/E-250/E-350) — Vehicle-Side Plug-In T-Connector

The CURT 56020 is a vehicle-side, plug-and-play 4-way flat trailer wiring harness designed to add a standard trailer connector to select Ford E-Series (E-150, E-250, E-350) trucks without cutting or splicing factory wiring.

If your Ford E-Series doesn’t already have trailer wiring, this CURT T-connector provides a factory-compatible solution that installs quickly and preserves the vehicle’s original wiring. The harness uses vehicle-specific OEM-style connectors to tap into the tail light assembly and delivers a standard 4-flat output for brake lights, turn signals and running lights. A dust cover and all necessary wiring hardware are included so you can tow with confidence and keep the connector clean when it’s not in use.

How does this harness install on my Ford E-Series?

The CURT 56020 is engineered for a straightforward plug-in installation that avoids cutting, splicing or soldering. It connects to the vehicle’s taillight sockets using matching OEM-style plugs, then mounts the 4-flat socket near the hitch for easy trailer hookup.

• Vehicle-specific T-connector plugs into factory taillight harness
• No need to alter or splice factory wires
• Mounts near the receiver for convenient access
• Includes dust cover to protect the connector from dirt and moisture

What lighting functions will this 4-way flat support?

This harness provides the industry-standard 4-flat output to operate a trailer’s running lights, turn signals and brake lights. It does not provide power for electric trailer brakes or reverse lights—those require a separate controller or additional wiring solution.

• Combined tail/running light circuit
• Left and right turn signal/brake light circuits
• Standard 4-flat connector compatibility with most small trailers and cargo carriers
• Not designed for trailer brake or auxiliary power circuits

Will this harness affect my vehicle warranty or wiring?

Because the CURT 56020 is a custom-fit, OEM-compatible T-connector, installation keeps the factory harness intact and avoids permanent splices. That approach minimizes alteration to the vehicle’s wiring and makes it easier to return to stock configuration if needed.

• Uses vehicle-specific connectors for a non-destructive install
• Retains factory wiring integrity and appearance
• Can be removed without cutting factory harnesses
• Backed by a limited one-year CURT warranty for defects in materials and workmanship

What hardware and protection does the kit include?

The package contains the wiring harness with OEM-style plugs, a 4-way flat socket, mounting hardware and a dust cover. These items help secure the connector near the receiver and protect electrical contacts from corrosion when not connected to a trailer.

• Complete wiring harness with vehicle-specific connectors
• 4-way flat trailer socket for standard trailers
• Dust cover to shield pins from weather and debris
• Installation hardware included for secure placement

Who is this for: The CURT 56020 is ideal for owners of compatible Ford E-150, E-250 and E-350 trucks who need a simple, reversible trailer wiring solution. It’s best for drivers towing small trailers, utility carriers, or lightweight loads that require standard lighting connections but not electric brakes or auxiliary power. If you want a fast, vehicle-specific install that preserves factory wiring, this harness is a practical, dependable choice.