Semi-Truck Safety, Air & Electrical Universal
Semi-Truck Safety, Air & Electrical parts from 4 State Trucks can help keep your truck on the road. From air compressors and valves to fuses and lights, find the parts you need for air system maintenance and electrical repairs. Explore our selection to help maintain your truck's performance.
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4-Way Or 6-Way Round Connector Mounting Bracket
CURT MANUFACTURING
$1.59Zinc Plated Steel Mounting Bracket For 4 Way Or 6 Way Round Connector Socket * High Quality Connector Mounting Bracket* Securely Mounts 4-Way Or 6-Way Round Connector Sockets * Allows For Attachment To The Vehicle Or Trailer Hitch * Multiple Screw Holes...$1.59 -
Non-Powered 3-To-2 Wire Taillight Converter W/ 4-Way Flat Output To Connect Turn Signal, Brake Lights, & Tail Lights
CURT MANUFACTURING
$23.79Non-Powered 3-To-2-Wire Taillight Converter W/ 4 Way Output & Color Coded Wires - Mounts To Surface Board * High Quality Taillight Converter* Converts 3-Wire Vehicle Electrical System To Standard 2-Wire Trailer Wiring * 4-Way Flat Output Connects Tail...$23.79 -
3-To-2 Wire 24-Volt Splice-in Taillight Converter For 24V Automotive Systems,Trucks, Busses, Cab Chassis
CURT MANUFACTURING
$48.9924-Volt Splice-In Taillight Converter For Trucks, Busses, Cab & Chassis WiringConverts 3-Wire System To Standard 2-Wire On Incandescent & LED Trailer Lighting Systems * High Quality Taillight Converter* Primarily Used For 24V Automotive Systems, Busses,...$48.99 -
7-Way RV Blade Custom Wiring Harness Extension Isolator Hardware Kit For Aluminum Truck Beds
CURT MANUFACTURING
$13.19Custom Wiring Harness Extension Isolator Hardware Kit For Aluminum Truck Beds * High Quality Hitch* Securely Mounts A 7-Way RV Blade Extension Harness In An Aluminum Truck Bed * Neoprene Well Nuts Isolate Steel Bolts From Aluminum Surfaces * Includes...$13.19 -
Vehicle-Side 4-Way Round Connector Socket W/ Spring-Loaded Dust Cover
CURT MANUFACTURING
$17.29Die-Cast Metal Vehicle-Side 4-Way Round Trailer Wiring Harness Socket W/ Spring-Loaded Dust Cover * High Quality Connector Socket* Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 4-Way Round Output Connects Tail Lights, Brake...$17.29 -
4-Way Flat License Plate Light Plug Connector Socket W/ 36 Inch Wires
CURT MANUFACTURING
$6.594 Way Flat License Plate Light Plug Connector Socket W/ 36 Inch 16-Gauge Color Coded Wire * High Quality License Plate Light Plug Connector Socket* Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 1-1/4 Inch Plug Fits A Typical...$6.59 -
Powered 3-To-2 Wire Taillight Converter W/ 4-Way Flat Output
CURT MANUFACTURING
$90.99Splice-In Powered 3-To-2 Wire Taillight Converter W/ 4-Way Flat Output, Snap Locks & Color-Coded Wires * High Quality Taillight Converter* Converts 3-Wire Vehicle Electrical System To Standard 2-Wire Trailer Wiring * 4-Way Flat Output Connects Tail...$90.99 -
Vehicle-Side 7-Way RV Blade Connector Socket W/ Integrated Bracket
CURT MANUFACTURING
$14.69Vehicle-Side 7-Way RV Blade Connector Socket W/ Integrated Bracket, Concealed Terminals & Spring Loaded Dust Cover * High Quality RV Blade Connector Socket * Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 7-Way Connects Tail,...$14.69 -
5-Way Flat Connector Mounting Bracket W/ Hardware
CURT MANUFACTURING
$6.595-Way Flat Connector Mounting Bracket * High Quality Connector Mounting Bracket* Securely Mounts A 5-Way Flat Connector Socket * Allows For Attachment To The Vehicle Or Trailer Hitch * Constructed From High-Strength Steel * Protected By A Durable Black...$6.59 -
Vehicle-Side 6-Way Round Connector Tester W/ LED Indicators
CURT MANUFACTURING
$13.19Black Plastic Vehicle-Side 6-Way Round Connector Tester W/ LED Indicators For Brake, Turn, Electric Brakes, Aux. Power * High Quality Connector Tester* Confirms Proper Function Of Vehicle-Side Wiring Connector * Tests 6-Way For Tail, Brake, Turn Signals,...$13.19 -
1.25 Inch 4-Way Flat License Plate Light Plug Adapter
CURT MANUFACTURING
$8.091.25 Inch 4-Way Flat License Plate Light Plug Adapter * High Quality License Plate Light Plug Adapter* Allows A 4-Way Flat Socket To Be Mounted In A License Plate Light Hole * 1-1/4 Inch Plug Fits A Typical License Plate Light Hole * Simple Plug-And-Play...$8.09 -
5-Way Flat Connector Socket W/ 60 Inch 16-G Color Coded Wires
CURT MANUFACTURING
$11.89Vehicle-Side 5-Way Flat Connector Socket W/ 60 Inch 16-G Color Coded Wires * High Quality Connector Socket* Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 5-Way Flat Connects Tail Lights, Brake Lights, Turn Signals And Reverse...$11.89