Seamaka 7 Pin Trailer Plug Adapter — 7-Way to 7-Blade + 4-Flat Dual Output, Spring-Loaded Cover

Seamaka's 7 Pin Trailer Plug is a dual-output wiring adapter that converts a vehicle's 7-way socket into both a 7-blade and a 4-flat trailer connector for versatile towing compatibility.

When you switch between trailers or tow different loads, mismatched connectors slow you down. This Seamaka adapter gives your truck a combined 7-blade and 4-flat output from a single factory 7-way socket. Built for common Ford, GM, Jeep, Ram and other trucks, it simplifies hook-ups and protects electrical contacts with a spring-loaded cover.

How does this adapter make connecting trailers faster?

Instead of swapping harnesses or carrying multiple adapters, the Seamaka 7 Pin Trailer Plug delivers both connector types at once. That means you can plug either a 7-blade or a 4-flat trailer into the same vehicle-side socket without extra reconfiguration.

• Provides simultaneous 7-blade and 4-flat outputs for quick compatibility.
• Mounting bracket and hardware included for secure installation.
• Spring-loaded cover keeps corrosion and dirt out of contacts.
• Pure copper internal wires for improved conductivity and reliable signals.

Will this fit my truck’s factory 7-way socket?

The adapter is designed to mate with standard vehicle-side 7-way sockets found on many Ford, GM, Jeep, Ram and GMC models. Its universal form factor accommodates most factory tow sockets so you can use it on a wide range of vehicles without modification.

• Compatible with common factory 7-way sockets on trucks and SUVs.
• No vehicle-side rewiring required—plugs directly into the existing socket.
• Includes a bracket and fasteners for neat, secure mounting near the hitch.

What materials and protections keep the connector reliable?

Seamaka built this adapter from robust plastic for a lightweight yet durable housing and used pure copper wiring for superior electrical conductivity. The connector also includes a snug, spring-loaded cover to minimize moisture and grime exposure to pins, extending service life.

• Durable, impact-resistant plastic housing resists road wear.
• Pure copper internal conductors for consistent signal and power transfer.
• Spring-loaded dust cover reduces corrosion risk when not in use.

Which trailer functions does this harness support?

It carries the standard trailer circuits so you can operate taillights, brake lights, turn signals and auxiliary power; it also supports trailer brakes where applicable. That makes it suitable for small utility trailers up to larger towing setups that rely on a 7-way connection.

• Transmits taillights, brake lights, turn signals and reverse lights.
• Delivers auxiliary 12V power for trailer accessories.
• Supports electric trailer brake circuits when using the 7-blade connection.

Who this is for: Drivers who tow different trailers, fleet technicians, RV owners and weekend haulers who need a single, dependable adapter to bridge 7-way vehicle sockets to both 7-blade and 4-flat trailer plugs. If you want faster hook-ups, reduced clutter, and protection for your towing socket, the Seamaka dual-output trailer plug provides a practical, vehicle-side solution.