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Black rectangular trailer connector housing with 7-blade and 4-flat sockets, hinged weatherproof lid, powder-coated bracket

Bluarc Electronics

Bluarc Electronics Multi-Tow 7 Blade 4 Flat Trailer Connector 16" Extension USCAR Plug

SKU CH-ER0K-Y9QMS

A 16-inch extension adds a 7-blade and 4-flat connector with a 180-degree weatherproof lid for multiple towing options from one plug

  • Multi-towing from one connector with 7-blade and 4-flat options
  • Exact-fit OEM connectors enable plug-and-play installation
  • Weatherproof lid opens 180 degrees with oversized hinge for durability
  • Stainless steel hardware and nickel-coated pins resist corrosion
  • Includes mounting bracket and hardware for complete installation

Multi-Tow 7 Blade 4 Flat Connector

This trailer connector combines a 7-blade RV socket and a 4-flat trailer plug in one housing. It suits owners who tow both a caravan and a utility trailer and want a single factory-style connection point. The 16-inch USCAR extension plugs directly into the vehicle harness for plug-and-play installation. Builders needing a dedicated 5th-wheel or gooseneck interface will need a different solution.

7 Blade and 4 Flat Capacity

The 7-blade side delivers power, braking and auxiliary circuits for an RV while the 4-flat side runs tail lights and turn signals on a standard trailer. Both circuits are live simultaneously so you can switch trailers without rewiring. The single USCAR plug limits total current to the vehicle’s factory fuse rating, so heavy auxiliary loads on the RV circuit may trip that fuse. Users requiring isolated battery-charge lines or electric-brake controllers beyond the factory rating should verify their vehicle’s wiring capacity.

Weatherproof Housing and Mounting

A lid opens 180 degrees on an oversized hinge to shield pins from rain and road spray. Nickel-coated pins and a powder-coated bracket resist corrosion during year-round exposure. Stainless-steel hardware is included for a secure mount on most flat surfaces. The connector draws no power itself and adds no measurable electrical load to the vehicle system.

Highlights

  • Multi-towing from one connector with 7-blade and 4-flat options
  • Exact-fit OEM connectors enable plug-and-play installation
  • Weatherproof lid opens 180 degrees with oversized hinge for durability
  • Stainless steel hardware and nickel-coated pins resist corrosion
  • Includes mounting bracket and hardware for complete installation

Specifications

BrandBluarc Electronics

Questions about this item

Will the 16" USCAR plug reach my factory harness without splicing?

The 16" extension plugs directly into the USCAR socket on most late-model trucks and SUVs, so no splicing is needed for a standard installation.

How can I verify the 7-blade and 4-flat circuits are live after I bolt the bracket on?

Connect a trailer or circuit tester to each socket; the 7-blade should show battery, brake, turn and ground, while the 4-flat should show tail, left turn, right turn and ground.

Does the kit include the stainless-steel hardware and powder-coated bracket shown in the photos, or do I buy them separately?

The box contains the connector housing with 180-degree lid, nickel-coated pins, a powder-coated mounting bracket and all stainless-steel mounting hardware — nothing extra is required.

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