Nilight 7-Way USCAR to 7-Pin RV + 4-Pin Flat Trailer Adapter — Dual-Output Harness with Mounting Bracket

Nilight's dual-output adapter converts a vehicle's 7-way USCAR socket into both a 7-pin RV plug and a 4-pin flat outlet, letting you tow multiple trailer types without rewiring.

If your truck or SUV has a factory 7-way USCAR connector but you need to hook up older trailers or auxiliary equipment, this Nilight harness creates two ready-to-use outputs: a 7-pin RV blade plug and a standard 4-pin flat socket. The assembly is built to plug into the vehicle's USCAR socket with minimal splicing, includes a mounting bracket and hardware, and uses a protective wire loom and spring-loaded covers to resist weather and corrosion.

How does this adapter simplify towing different trailers?

The dual-output layout lets you quickly switch between trailers with 7-pin or 4-pin plugs without swapping adapters or modifying your vehicle wiring. Both outlets are wired to the vehicle's existing circuits so lights, turn signals, brakes (if present), reverse lamps and auxiliary power function through the same factory connection.

• Two outputs in one unit: 7-pin RV blade and 4-pin flat socket
• Plugs into factory 7-way USCAR socket—no separate converters needed
• Wires taillights, turn signals, brake circuit, reverse lights and power
• Includes bracket and mounting hardware for tidy installation

Will this fit my vehicle and is installation difficult?

This harness is made specifically to mate with industry-standard USCAR 7-way sockets used on many factory tow packages. Installation is nearly plug-and-play: the adapter inserts into the vehicle's USCAR receptacle and secures with the included bracket, requiring little to no wire modifications for most setups.

• Compatible with vehicles equipped with a 7-way USCAR socket
• Plug-in connection minimizes splicing and wiring work
• Mounting bracket and bolts supplied to secure the harness
• Black wire loom protects the harness during installation

How does it handle weather and long-term use?

Nilight engineered the adapter to endure outdoor exposure: spring-loaded dust covers shield both the 7-pin and 4-pin contacts when not connected, reducing moisture and debris intrusion. The wiring is routed inside a protective loom to guard against abrasion and the connector materials are made to resist corrosion for dependable service life.

• Spring-loaded dust covers keep contacts dry and clean
• Durable black wire loom resists wear and rodent damage
• Connector materials formulated to limit rust and oxidation
• Designed for repeated plug/unplug cycles in field use

What electrical functions are supported through the adapter?

This adapter routes the vehicle's standard trailer circuits to both outputs so lighting and braking features work as expected across compatible trailers. Use it to power trailer taillights, brake lights, turn signals, reverse lamps and any auxiliary 12V feed your trailer requires.

• Taillights and brake light circuits forwarded to both sockets
• Turn signals and reverse lamp wiring passed through
• Auxiliary 12V power available to the trailer via 7-pin output
• Maintains factory wiring behavior when installed properly

Who is this for? The Nilight Dual Output 4 & 7-Way USCAR Trailer Adapter is aimed at drivers who tow different trailer types and want a neat, reliable way to connect without altering their vehicle's factory tow harness. It's ideal for RV owners, contractors, weekend boaters and fleet vehicles that encounter both 4-pin and 7-pin trailers and need a robust, weather-resistant, plug-in solution.