Black plastic trailer plug adapter with a cylindrical 7-way round connector and multiple pin slots. The adapter features two mounting flanges with screw holes for secure installation. Labeled “F74F” and branded with “Hi-Volta BROPHY Products,” this Pollak-style connector is designed to convert OEM 7-way round vehicle plugs to standard 4-way flat trailer connections for Ford, Dodge, and GMC towing systems
C. R. Brophy Machine Works

Brophy Electrical Adapter F74F 7-Way Round to 4-Way Flat Plug (Pollak Style OEM Ford Dodge GMC 12V Trailer Wiring Lighting Converter Connector)

In stock
SKU: F74F
$9.95 USD

Description

Brophy F74F 7-Way Round to 4-Way Flat Trailer Wiring Adapter

The C.R. Brophy F74F 7-way round to 4-way flat trailer plug adapter converts factory-installed 7-pole RV blade vehicle sockets into standard 4-pin flat utility trailer connectors without cutting or splicing wires. Engineered in the industry-standard Pollak style, this direct plug-and-play electrical converter bridges factory 12-volt vehicle harnesses on Ford, Dodge, RAM, and GMC trucks to deliver instant power to trailer running lights, brake lights, and turn signal circuits. Built with a weather-resistant molded thermoplastic housing and highly conductive brass terminals, it ensures continuous electrical signal integrity across commercial and recreational hauling applications.

Best Used For:

  • OEM Vehicle Spliceless Conversion: Adapting factory 7-way round blade sockets on modern pickup trucks and SUVs to power standard 4-way flat trailer harnesses instantly.
  • Light-Duty Utility and Boat Towing: Supplying synchronized 12V power to trailer taillights, stop signals, and turn indicators on watercraft haulers and landscape trailers.
  • Fleet and Multi-Trailer Operations: Enabling rapid towing transitions between commercial 7-pin equipment trailers and light-duty 4-pin utility trailers without rewiring.

Key Performance & Safety Features

  • Plug-and-Play Electrical Interface: Plugs directly into existing 7-way vehicle sockets for tool-free, instant 4-way flat circuit conversion.
  • Pollak-Style Form Factor: Precision-molded alignment keys and locking tab notches ensure a tight, vibration-proof fit into OEM truck sockets.
  • Corrosion-Resistant Brass Terminals: High-conductivity brass electrical contact pins resist oxidation, pitting, and voltage drop across all lighting circuits.
  • Rugged Molded Thermoplastic Body: Impact-resistant thermoplastic casing withstands severe road vibrations, impact shock, and broad temperature fluctuations.
  • Weather-Sealed Protective Design: Tight mechanical tolerances shield internal terminal pins from road moisture, mud, salt spray, and debris.
  • Compact In-Line Profile: Streamlined, compact design fits neatly into vehicle bumper sockets and stores effortlessly in toolboxes or glove compartments.

What's Included

  • (1) C.R. Brophy F74F 7-Way Round to 4-Way Flat Plug Adapter (Pollak Style)

Technical Specifications

Brand C.R. Brophy Machine Works
Model Number F74F
Product Type Trailer Wiring Electrical Adapter / Converter
Vehicle-Side Connector 7-Way Round Blade Connector (RV Style / Pollak Interface)
Trailer-Side Connector 4-Way Flat Molded Female Connector
System Voltage Rating 12 Volts DC (Automotive / Towing Standard)
Terminal Pin Material High-Conductivity Solid Brass
Housing Material High-Impact Molded Thermoplastic Polymer
Circuits Supported Running Taillights, Left Stop/Turn, Right Stop/Turn, Ground
Vehicle Compatibility Ford, Dodge, RAM, GMC, Chevrolet OEM 7-Way Sockets
Installation Type Direct Plug-In (No Wiring, Splice-Free)
Packaging Quantity Sold Individually (1 Adapter per Pack)

Pro-Tip: Apply a small dab of dielectric grease to both the 7-way brass terminals and the 4-way flat pins prior to installation to seal out road grime, prevent oxidation, and ensure maximum electrical conductivity.