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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Powered 3-To-2 Wire Taillight Converter W/ Potted Enclosure, 4-Way Flat Output
CURT MANUFACTURING
$88.99Weather-Resistant, Powered 3-To-2-Wire Splice-In Trailer Taillight Converter W/ 4 Pin Wiring Harness * High Quality Taillight Converter* Converts 3-Wire System To 2-Wire Trailer Light Wiring * Potted Enclosure Significantly Increases Water And Vibration...$88.99 -
4-Way Flat License Plate Light Plug Adapter
CURT MANUFACTURING
$5.294-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 Design...$5.29 -
Powered 3-To-2 Wire Taillight Converter W/ 4-Way Flat Output, Snap Locks, & Color Coded Wires
CURT MANUFACTURING
$46.99Splice-In 3-To-2 Wire Trailer Tail Light Converter W/ Snap Locks, Color Coded Wires & 4-Pin Wiring Harness * High Quality Taillight Converter* Converts 3-Wire Vehicle Electrical System To Standard 2-Wire Trailer Wiring * 4-Way Flat Output Connects Tail...$46.99 -
Vehicle-Side Heavy Duty 7-Way RV Blade Connector Socket W/ Spring-Loaded Dust Cover
CURT MANUFACTURING
$17.29Black Plastic Vehicle-Side Heavy Duty 7-Way RV Blade Connector Socket, W/ Spring-Loaded Dust Cover * High Quality RV Blade Connector Socket* Weather-Resistant Dust Cover Features A Rubber Insert To Seal Out Moisture * Spring-Loaded Cover Also Helps Keep...$17.29 -
Black Plastic Vehicle-Side 5-Way Flat Connector Tester W/ LED Lights
CURT MANUFACTURING
$10.59Vehicle-Side 5-Way Flat Connector Tester W/ LED Lights * High Quality Connector Tester* Confirms Proper Function Of Vehicle-Side Wiring Connector * Tests 5-Way Flat For Tail Lights, Brake Lights, Turn Signals And Reverse Lights * Constructed With LED...$10.59 -
Black Molded Rubber Vehicle-Side 5-Way Flat Connector Dust Cover
CURT MANUFACTURING
$0.41Vehicle-Side 5-Way Flat Connector Dust Cover * High Quality Connector Dust Cover* Protects Connector From Water, Dust And Road Grime When Not In Use * Helps Prevent Internal Corrosion For A Long Operating Life * Fits Virtually Any 5-Way Flat Connector...$0.41 -
Vehicle-Side 4-Way Flat Connector Socket W/ Hardware
CURT MANUFACTURING
$14.69Vehicle-Side 4-Way Flat Connector Socket W/ Color-Coded Wire, Snap Locks, Mounting Bracket & Hardware * High Quality Connector Socket* Splices Into Vehicle Wiring To Provide A Connection To The Trailer Plug * 4-Way Flat Output Connects Tail Lights, Brake...$14.69 -
7-Way RV Blade Connector Mounting Bracket W/ Slotted Screw Holes
CURT MANUFACTURING
$9.39Gloss Black Steel 7-Way RV Blade Connector Mounting Bracket * High Quality Connector Mounting Bracket* Mounts A 7-Way RV Blade Connector Socket * Attaches To A Long Bracket Mount 09-055000091 For Easy, No-Drill Installation * Slotted Screw Holes Allow...$9.39 -
Black Molded Rubber Vehicle-Side 5-Way Flat Connector Dust Cover - Packaged
CURT MANUFACTURING
$3.99Vehicle-Side 5-Way Flat Connector Dust Cover * High Quality Connector Dust Cover* Protects Connector From Water, Dust And Road Grime When Not In Use * Helps Prevent Internal Corrosion For A Long Operating Life * Fits Virtually Any 5-Way Flat Connector...$3.99 -
4-Way Flat Vehicle To 7-Way RV Blade Trailer Electrical Adapter W/ Brake Controller
CURT MANUFACTURING
$122.99Plug-And-Play 4-Way Flat Vehicle To 7-Way RV Blade Trailer Electrical Adapter W/ Brake Controller & Spring Loaded Dust Cover * High Quality Electrical Adapter* Adapts A 4-Way Flat Vehicle Socket To Fit 7-Way RV Blade Trailer Plugs * Simple Plug-And-Play...$122.99 -
Gloss Black Steel 4-Way And 6-Way Round Connector Mounting Bracket
CURT MANUFACTURING
$8.09Gloss Black Steel 4-Way & 6-Way Round Connector Mounting Bracket * High Quality Connector Mounting Bracket* Made Of High-Strength Steel* Mounts 4-Way Or 6-Way Round Connector Sockets * Attaches To A Short Bracket Mount 09-055000097 For Easy, No-Drill...$8.09 -
Clamp-On Connector Bracket Mount For 4, 5 Or 6-Way Bracket
CURT MANUFACTURING
$22.49Universal Clamp-On Connector Bracket Mount For 4, 5 Or 6-Way Bracket * High Quality Connector Bracket Mount* Made Of High-Strength Steel* Short, Universal Clamp-On Mount For 4, 5 And 6-Way Socket Brackets * Compatible With Flat And Round 4-Way, 5-Way And...$22.49