CURT USCAR Trailer Connector — Dual-Output 7-Way RV & 4-Way Flat, Plug-and-Play with Mounting Bracket

CURT 55774 is a plug-and-play dual-output trailer wiring connector that converts a compatible factory USCAR tow plug into both a 7-way RV blade and a 4-way flat socket for towing needs.

This custom wiring connector is designed to fit vehicles that already include a USCAR-style factory tow socket, allowing you to avoid cutting, splicing, or soldering when adding trailer wiring. The assembly gives you both a 7-way RV blade and a 4-way flat output in one compact unit, includes dust covers for weather protection, and comes with a metal mounting bracket so the connector sits neatly and securely at the factory location.

How does this connector simplify trailer wiring installation?

The CURT 55774 plugs directly into the vehicle’s OEM USCAR tow socket, eliminating the need to access tail lamp wiring or run aftermarket splices. Install time is typically short because the connector uses the vehicle’s pre-wired plug and a included bracket for a factory-like fit.

• Plugs into compatible original equipment USCAR tow socket—no cutting or splicing
• Mounting bracket included for secure, factory-mounted position
• Pre-molded connector housings match OEM installation points
• Dust covers protect contacts when not in use

What trailer functions are supported by the 7-way and 4-way outputs?

Both connector types cover common trailer electrical needs: the 4-way flat handles basic lighting, while the 7-way RV blade supports additional functions such as electric trailer brakes and auxiliary power. The 55774 routes signals from the vehicle’s factory wiring to each socket without altering the original harness.

• 4-way flat: tail, brake, and turn signals
• 7-way RV blade: adds reverse, electric brakes, and 12V auxiliary power
• Maintains factory wiring integrity—no tapping into lamp assemblies
• Suitable for trailers requiring combined socket types

Will this work on every vehicle and how do I confirm fitment?

This unit is USCAR-specific and will only function as plug-and-play where the vehicle includes the matching factory USCAR connector. Confirm your vehicle’s tow socket type and the exact mounting location before ordering to ensure compatibility.

• Requires factory USCAR tow plug/socket—check vehicle documentation
• Not a universal replacement or extension harness
• Refer to vehicle application guides or dealer to verify the OEM connector type
• Designed to occupy the factory connector location for a clean install

How does the 55774 hold up outdoors and over time?

The connector uses durable plastic housings, protective slit loom, and dust covers to resist weather and road debris. The included metal mounting bracket keeps the assembly stable, reducing wear at the connection point for longer service life.

• Durable black plastic housings resist impact and UV exposure
• Protective slit loom shields the wiring bundle from abrasion
• Dust covers help prevent dirt and moisture buildup on contacts
• Metal bracket secures connector to factory mounting point

Who is this for: The CURT 55774 is ideal for vehicle owners who already have a factory USCAR tow plug and want a ready-made, reliable way to equip their vehicle for towing without cutting or splicing factory wiring. It suits drivers who need both a 4-way flat for basic trailer lighting and a 7-way RV blade for trailers with brakes or auxiliary power—delivered in a weather-resistant, OEM-style installation.