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Trailer Plugs And Adapters

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Custer Products Trailer Socket Adapters

These socket and plug adapters will let you change from flat to round wiring and from 7-way to 4-way function. These adapters are from Custer Products. Please select which configuration you would like from the drop down above.
$8.39 $28.49

4-Way Replacement Socket

Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
$12.99

Grote 4 Pole Trailer Socket With Enclosed Terminals

  • 2 mounting holes - 0.26” by 0.37”
  • Mount holes 2.83” center to center of screw holes
  • Stainless steel spring
  • 2, 1/4" mounting holes (82-1020)
  • Solid brass pin terminals for best conductivity
  • Die-cast housing for superior corrosion resistance


  • Technical Specifications
  • Pack Quantity: 1
  • Standards: SAE J560
  • Material: Zinc die-cast
  • Product Type: Connector
  • Style: Heavy-Duty
  • Terminals: split pin, enclosed
  • Plug / Socket #: 4 Pole
  • Voltage: 12-24V
  • Amperage: 35A
  • $9.69

    Velvac 7 Wire Female RV Plug Flat Pin Style

    Going camping for the weekend? Make sure your truck s lighting system is up to the challenge with this replacement 7-wire female RV plug. This screw-type socket is primarily used in RV applications and includes seven flat blades. The plug is constructed of molded PVC for impact resistance.
    $10.62

    Miller Socket 4 Way

    This is a Miller Industries 4-Way Socket. All sockets and plugs have contacts that float for proper connection with mating receptacles. The terminals will accept up to 12 gauge wire. A cable clamp will hold just about all cable sizes firmly.
    $22.09

    12V MultiSockets, 3 Socket, Hardwired

    These MultiSockets give you additional 12V DC outlets to power laptops, cell phones, navigation systems, PDAs and other DC-powered accessories.
    $13.22

    Velvac 7 Wire Female Socket Round Pin Style with Split Pins

    7 Round Pin female plug for 7 wire trailer cord. Typically used on semi truck/trailer installations
    $12.25

    TowMate Adapta-Box Universal Trailer Wiring Connection

    Always have the right lighting connection for the trailer you are pulling or towing with your wrecker or car carrier. New from TowMate, the Adapta-Box offers four popular trailer wiring receptacles, so you can use the trailer’s factory marker lights and stop/tail/turn signals while moving through traffic.
    $395.99

    Grote Heavy Duty 4 Way 4 Pole Plug With Spring

  • Replacement for CR-5
  • Stainless steel spring
  • 2, 1/4" mounting holes (82-1020)
  • Solid brass pin terminals for best conductivity
  • Die-cast housing for superior corrosion resistance


  • Technical Specifications:
  • Pack Quantity: 1
  • Material: Zinc die-cast
  • Product Type: Connector
  • Style: Heavy-Duty
  • Plug / Socket #: 4 Pole
  • Voltage: 12-24V
  • $7.59

    Velvac 7 Way Grip Male Plug

    7 Pin male plug-in for 7 wire trailer cord.
    $13.99

    4-Way Replacement Plug

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $8.99

    IPA 7 Round Pin Trailer Circuit Chaser

    Allows one person to test both male and female 7-round pin tractor-trailer plugs and more. In addition, the tester allows you to jump current to a dead circuit during emergencies so you can still drive your rig. Includes an extra jumper connector. It allows the jumping of current to a dead circuit for emergency situations so you can still drive the rig.
    $37.99

    Motec Zacklift Female 9 Pin Socket

    The Motec female 9-pole round socket has a universal application.
    $24.49

    IPA 7-Way Flat Pin Trailer Circuit Tester

    Test the towing circuits at the back of your truck with speed and ease. Tester is suited for older light and medium duty trucks and campers. The tester features LED lights that turn on to indicate when each circuit is working.
    $25.99

    Velvac Single Pole Socket

  • Durable zinc die cast housings
  • Power and ground terminals on single pole socket hold up to 1/0 gauge wire
  • Single pole socket may be soldered or crimped
  • Mounting holes 3 inch on center
  • $13.69

    Race Sport Pre-Wired 5-Pin Socket

    Today it’s all about projects you can do yourself, and the Relay w/ Prewired 5-Pin Socket lets you do just that! Hooking up your lights couldn’t be easier with this socket. Capable of handling 40 amps, this socket can easily work in your projects. Plus, you can save yourself a little bit of time as it comes pre-wired!
    $49.99

    Motec Zacklift Male 9 Pin Socket

    The Motec male 9-pole round socket has a universal application.
    $22.89

    EZ Connector Universal 2 Foot Truck Side Hardwired Bumper Cable

    Ez Connectors R7-05 serves as the vehicle end of the original EZR7 product line and also functions as a dummy plug. It is designed for hard wire installation on the bumper of the vehicle. The unit includes 2 feet of cord on the vehicle, a mounting bracket, a dummy plug, butt connectors, sealant-type heat shrink tubing for a waterproof splice, and a tie wrap for securing it to the vehicle. When connecting, you remove the dummy plug from the vehicle socket and place it in the trailer plug holder.
    $74.99

    EZ Connector Universal 4 Foot Trailer Side Hardwired Bumper Cable

    The EZ Connector R7-07 is the trailer end of the EZR7 product line. It includes 4 feet of cable, a plug holder, butt connectors, sealant type heat shrink tubing for a watertight splice, and a heavy-duty tie wrap to secure the cable to the tongue.
    $74.99

    IPA Truck and Trailer Pin Master Cleaner Set

    The Only Set of Tools to Clean Every North American Trailer Connector. The Truck and Trailer Pin Master Cleaner Set is designed for use on 4/5, 6-way round, 7-way flat (spade) and 7-way round truck and trailer electrical terminals. The unique, patented design allows for precise removal of corrosion from both male and female pins, while maintaining proper pin dimensions and is also great for cleaning butt and bullet type connectors found on most tail and side marker assemblies. Packaged in a leather-style holster with magnetic clasp, it includes custom-sized swabs for removing debris and applying the supplied contact enhancer solution.
    $90.99

    Velvac Single Pole T-Grip Plug

  • Used to provide power to heavy draw auxiliary trailer equipment
  • Heavy-duty zinc die cast housings
  • Power and ground terminals hold up to 1/0 gauge wire
  • $12.49

    7-Way Replacement Flat Socket

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $13.99

    IPA 12V Trailer Plug Power Adapter

    Dual accessory sockets useful for powering a large range of equipment and accessories. Use for work and recreation.
    $21.99

    Ken-Tool Pigtail Plug Safety Shims

    Compatible with all manufacturers, the Pigtail Plug Safety Shims from Ken-Tool hold the plug in the receptacle to keep on the tail lights. On top of that, they create a tighter fit for the plug in the socket.
    $13.49

    Zacklift 9 Way Plug w/ Female End and 18" Wire Lead

    This is a Zacklift 9-way plug. It has a female end, and measures 18" wire lead.
    $116.99

    7-Way Replacement Plug

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $24.99

    IPA 3-Way Trailer Adapter

    The 3-Way Trailer Adapter allows 7-way flat (spade) pin type terminal connections to 6-way round and 4/5 pin trailer connections.
    $23.99

    EZ Connector Universal Male Socket to 7 Way Female Socket

    EZ Connector’s EZR7 and EZS7 female connectors, which are mounted on a vehicle, to trailers that are equipped with a legacy 7-blade RV connector. This enables vehicles with the EZ system to connect to older or less frequently used trailers that do not have the EZ system.
    $49.99

    Velvac Mounting Bracket for Seven-Way Blade Socket

    CURT electrical connector brackets provide a simple solution for mounting wiring to your trailer hitch or the rear of your vehicle. Connector wires can be a nuisance when they are just lying around. They can get tangled up with cargo and even damaged. An electrical connector left to hang off the back end of your vehicle is an even greater hazard. Secure, protect and optimize the use of your electrical connector by mounting it with a CURT connector bracket. This trailer wire connector bracket is designed to hold a 7-way RV blade socket. It features sturdy steel construction with a black finish and can be mounted on your vehicle or trailer hitch. When it comes to plugging in your trailer lights, it pays not to skimp out. CURT electrical is the smart way to ensure that your trailer lights and electrical systems are prepared for the road ahead. Keep the power flowing, no matter where your adventures take you, with quality electrical products from CURT.
    $4.69

    Velvac Seven-Way T-Grip ISO Plug

    Heavy-Duty Nickel-Plated Zinc Die Cast Housing, ISO Plug with Spring Guard.
    $10.99

    Zacklift 9 Pin Plug w/ Male Cable End

    This is a replacement Zacklift 9 pin plug w/ male cable end.
    $63.99

    Zacklift 9 Way Plug w/ Female End (No Wire)

    This is a replacement 9-Way Plug from Zacklift. The plug has a female end, and is a no-wire variant.
    $72.99

    7-Way Replacement Flat Plug

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $14.99

    Race Sport Socket sized Dual Port USB 3.1Amp with Blue LED

    Want to add USB charging capabilities to any dash panel or surface? This unit will do just that for you and light it up with a blue LED.
    $29.99

    Race Sport 2-Port Round Socket size with (1) USB Power port and (1) 3.5mm AUX input

    This is the perfect solution to add USB and AUX inputs into any area of your boat. This Rocker switch style product allows you to plug into any rocker switch slot, but run a through put of your USB and AUX without hanging wires out of your dash. This allows you to plug devices right into the rocker to accomplish that, while keeping a neat and clean look to your boat.
    $39.99

    Truck-Lite 7 Split Pin Flush Mount Receptacle

    Compact socket design with exposed terminals for easy installation in modern trailers. Extended interior plug prevents damage to shell. Integral finger grips for positive pull.
    $30.39

    Truck-Lite 7 Solid Pin Surface Mount Threaded Stacking Studs Receptacle

    Tough GE Noryl, non-conductive, corrosion resistant body. Floating type, cadmium-plated brass pins allow best alignment and long-lasting contact with plug|Internal connections feature a direct wired ground. Circuits are identified by color codes and embossed notations. Ring terminals are used to connect wires|Receptacle pins prevent increased resistance due to strand breakage caused by set screws.
    $43.59

    Truck-Lite 7 Solid Pin Surface Mount Receptacle

    Tough GE Noryl, non-conductive, corrosion resistant body. Floating type, cadmium-plated brass pins allow best alignment and long-lasting contact with plug|Internal connections feature a direct wired ground. Circuits are identified by color codes and embossed notations. Ring terminals are used to connect wires|Receptacle pins prevent increased resistance due to strand breakage caused by set screws.
    $50.99

    Truck-Lite 7 Split Pin Surface Mount Receptacle

    Tough GE Noryl, non-conductive, corrosion resistant body. Floating type, cadmium-plated brass pins allow best alignment and long-lasting contact with plug|Internal connections feature a direct wired ground. Circuits are identified by color codes and embossed notations. Ring terminals are used to connect wires|Receptacle pins prevent increased resistance due to strand breakage caused by set screws.
    $82.99

    Race Sport 2 Port USB Socket 3.1A Input: DC12V/24V Output: DC5V 3.1A totally 4led inside

    Want to add USB to any dash panel or surface? This unit will do just that for you and illuminates with four blue leds inside.
    $29.99

    Race Sport Dual Port Rocker Panel size with (1) USB Power port and (1) 3.5mm AUX input

    This is the perfect solution to add USB and AUX inputs into any area of your boat. This Rocker switch style product allows you to plug into any rocker switch slot, but run a through put of your USB and AUX without hanging wires out of your dash. This allows you to plug devices right into the rocker to accomplish that, while keeping a neat and clean look to your boat.
    $39.99

    Dual Port USB Rocker Panel sized with RED voltmeter

    The Marine Sport rocker style switch allows you to run through USB clean and neat in your boat. Using the blue led illumination, you can easily see this plug in at night.
    $29.99

    Dual Port USB Rocker Panel sized with Blue voltmeter

    The Marine Sport rocker style switch allows you to run through USB clean and neat in your boat. Using the blue led illumination, you can easily see this plug in at night.
    $59.99

    Redneck Trailer Supplies 6-Way Replacement Plug

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $10.99

    6-Way Replacement Socket

    Sockets and Plugs made with heavy-duty, zinc die-cast for maximum strength and durability.
    $40.99

    IPA 6-Way Round Pin Tractor Trailer Circuit Tester

    Test the towing circuits at the back of your truck with speed and ease. Tester is suited for older light and medium duty trucks and campers. The tester features LED lights that turn on to indicate when each circuit is working.
    $20.99

    Zip's Trailer Charge Cord

    Trailer charging cord is permanently attached to your semi tractor and then plugs in to your trailer to run a 12 volt hydraulic power unit or charge an auxilary battery.
    $130.00

    IPA 4/5 Pin Trailer Harness Tester

    One person can trace each lighting function on a trailer to the individual terminal it is connected to.
    $17.99
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