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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Vehicle-Side Die-Cast Metal 4-Way Round Connector Socket W/ Spring-Loaded Dust Cover, Concealed Terminals
CURT MANUFACTURING
$11.99Vehicle-Side Die-Cast Metal 4-Way Round Connector Socket W/ Spring-Loaded Dust Cover & Concealed Terminals * High Quality Round Connector Socket* Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 4-Way Round Output Connects Tail...$11.99 -
Zinc-Plated Steel 7-Way Round RV Blade Connector Mounting Bracket
CURT MANUFACTURING
$1.627-Way Round RV Blade Connector Mounting Bracket * High Quality Connector Mounting Bracket* Securely Mounts 7-Way Round Connector Sockets * Allows For Attachment To The Vehicle Or Trailer Hitch * Multiple Screw Holes Offer Flexible Mounting Options *...$1.62 -
Dual-Output Electrical Adapter W/ Tester Adapts 4-Way Flat Socket To Fit 4-Way Flat And 7-Way RV Blade Trailer Plugs
CURT MANUFACTURING
$54.194-Way Flat & 7-Way RV Blade Dual-Output Electrical Adapter W/ Trailer Plugs * High Quality Electrical Adapter* Adapts A 4-Way Flat Socket To Fit 4-Way Flat And 7-Way RV Blade Trailer Plugs * 4-Way Flat Output Connects Tail Lights, Brake Lights And Turn...$54.19 -
Clamp-On Connector Bracket Mount For 7-Way RV Blade Socket
CURT MANUFACTURING
$23.79Clamp-On Connector Bracket Mount For 7-Way RV Blade Socket * High Quality Connector Bracket Mount* Made Of High-Strength Steel * Long, Universal Clamp-On Mount For 7-Way Socket Brackets * Compatible With 7-Way Round And 7-Way RV Blade Sockets *...$23.79 -
Heavy Duty Black Plastic Replacement USCAR 7-Way RV Blade Socket W/ Dust Cover
CURT MANUFACTURING
$19.79Heavy Duty Black Plastic Replacement USCAR 7-Way RV Blade Socket * High Quality RV Blade Socket* Weather-Resistant Dust Cover Features A Rubber Insert To Seal Out Moisture * Spring-Loaded Cover Also Helps Keep Connector Clean When Not In Use * Plugs Into...$19.79 -
4-Way Flat Connector Socket W/ 60 Inch Color-Coded 16-G Wires Connects Tail, Turn, Brake Lights
CURT MANUFACTURING
$10.694-Way Flat Connector Socket W/ 60 Inch Color-Coded 16-G Wires * High Quality Flat Connector Socket* Splices Into Vehicle Wiring To Provide A Connection For A Trailer Plug * 4-Way Flat Output Connects Tail Lights, Brake Lights And Turn Signals *...$10.69 -
4-Way Round Connector Plug, Socket W/ Hardware
CURT MANUFACTURING
$25.094-Way Round Connector Plug & Socket Kit * High Quality Connector Plug And Socket* Made Of Die-Cast Metal * Splices Into Existing Wiring To Provide Connections For Both Vehicle And Trailer * 4-Way Round Output Connects Tail Lights, Brake Lights And Turn...$25.09 -
4-Way To 5-Way Flat Adapter For Boat Trailer Surge Brakes
CURT MANUFACTURING
$14.594-Way Vehicle To 5-Way Boat Trailer Flat Adapter For Boat Trailer Surge Brakes * High Quality Flat Adapter * Made Of Carbon Steel* Adapts Vehicle 4-Way Flat To Plug Into Boat Trailer 5-Way Flat * Intended For Boat Trailers With Surge Brakes * Fifth Wire...$14.59 -
Vehicle-Side 4-Way Round To 4-Way Flat Electrical Adapter Connects Tail Lights, Brake Lights, Turn Signals
CURT MANUFACTURING
$7.99Plug-And-Play Vehicle-Side 4-Way Round To 4-Way Flat Electrical Adapter W/ Slit Loom * High Quality Electrical Adapter* Made Of Plastic* Adapts A 4-Way Round Vehicle Socket To Fit 4-Way Flat Trailer Plugs * Simple Plug-And-Play Design Eliminates The Need...$7.99 -
Powered Converter Wiring Kit W/ 10 Amps Routes Power From Vehicle Battery To Powered Converter
CURT MANUFACTURING
$25.9920 Ft. 10 Amp Powered Converter Wiring Kit * High Quality Powered Converter Wiring Kit* Routes Power From Vehicle Battery To Powered Converter * Designed For Use With Battery-Powered Electrical Converters * 20 Feet Of 12 Gauge Cross-Linked Wire For...$25.99 -
18 Inch Trailer Hitch Fish Wire For 1/2 Inch Diameter Bolts
CURT MANUFACTURING
$3.09Trailer Hitch Fish Wire For 1/2 Inch Diameter Bolts * High Quality Wire Taillight Converter* Color Coded Wires* Makes It Easier To Lead Bolts And Spacers Through Tough-To-Reach Holes * Ideal For Installing A Trailer Hitch On A Vehicle With A Hollow Frame...$3.09 -
Easy-Mount Wiring Bracket For 4-Way, 5-Way Flat Connector Socket For 2 X 2 Inch Receiver Tube
CURT MANUFACTURING
$15.89Easy-Mount Wiring Bracket For 4-Way & 5-Way Flat Connector Socket * High Quality Wiring Bracket* Made Of Steel* Allows Connectors To Be Hitch-Mounted With No Drilling Or Clamping Required * Accepts 4-Way Or 5-Way Flat Connector Sockets * Fits Virtually...$15.89