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4 Flat Connectors, Adapters, and Testers
Ensure reliable electrical connections with our 4-flat connectors. These connectors are designed for ease of use and durability, providing secure connections for your trailer’s lighting system.
Our selection includes various lengths and configurations to suit different trailer setups, ensuring a perfect fit every time.
Stay connected on the road. Explore our 4-flat connectors today and ensure your trailer’s electrical system operates smoothly.
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4 Wire Flat Extension with Ground (32"). Utilizes an exterior vehicle frame ground with ring terminal. Includes dust cover, ny-ties, ground screw, and grease packet. corrosion resist
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Price:
$8.99
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4 Wire Flat Extension with Ground (48"). Utilizes an exterior vehicle frame ground with ring terminal. Includes dust cover, ny-ties, ground screw, and grease packet. corrosion resist
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Price:
$14.99
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4-WAY FLAT MALE/FEMALE, 12" LONG
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Price:
$4.99
Adapts vehicles with 4-wire flat to trailers with surge brakes and/or 5-wire flat connection - 47515
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Adapts vehicles with 4-wire flat to trailers with surge brakes and/or 5-wire flat connection.
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Price:
$9.99
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Curt 4-Way Flat Connector for Rewiring Trailer, Includes 20' Wires (Packaged) #57220
Perfect for rewiring your trailer, using the existing taillights
Provides a replacement connec
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Price:
$29.95
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CURT 58355 4-Pin Flat Wiring Harness, 48-Inch Vehicle-Side, 12-Inch Trailer-Side Wires
Splices into existing wiring to provide connections for both vehicle and trailer
4-way flat o
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Price:
$13.99
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CURT 58380 Vehicle-Side and Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
Splices into existing wiring to provide connections for both vehicle and trailer
Looped wire c
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Price:
$5.99
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CURT 58381 Vehicle-Side and Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
Splices into existing wiring to provide connections for both vehicle and trailer
Looped wire c
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Price:
$8.99
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CURT 58344 4-Pin Trailer Wiring Harness, 12-Inch Vehicle-Side and Trailer-Side Wires
Splices into existing wiring to provide connections for both vehicle and trailer
4-way flat out
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Price:
$11.99
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CURT 58304 4-Pin Flat Wiring Harness, 12-Inch Vehicle-Side and Trailer-Side Wires
Splices into existing wiring to provide connections for both vehicle and trailer
4-way flat output
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Price:
$8.99
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CURT 58050 Vehicle-Side and Trailer-Side 4-Pin Flat Wiring Harness with 72-Inch Wires
Splices into existing wiring to provide connections for both vehicle and trailer
Looped wire c
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Price:
$9.99
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CURT 58051 Vehicle-Side and Trailer-Side 4-Pin Flat Wiring Harness with 72-Inch Wires
Splices into existing wiring to provide connections for both vehicle and trailer
Looped wire c
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Price:
$14.99
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CURT 58030 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail light
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Price:
$3.99
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CURT 58031 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail
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Price:
$4.99
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CURT 58033 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail light
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Price:
$6.99
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CURT 58349 Trailer-Side 4-Pin Flat Wiring Harness with 48-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail light
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Price:
$10.99
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CURT 58032 Trailer-Side 4-Pin Flat Wiring Harness with 48-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail light
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Price:
$8.99
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CURT 58348 Trailer-Side 4-Pin Flat Wiring Harness with 48-Inch Wires
Splices into trailer wiring to provide a connection to the vehicle socket
4-way flat output connects tail light
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Price:
$11.99
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CURT 58042 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 48-Inch Wires
Splices into vehicle wiring to provide a connection for a trailer plug
4-way flat output connects tail
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Price:
$8.99
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CURT 58044 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 60-Inch Wires
Splices into vehicle wiring to provide a connection for a trailer plug
4-way flat output connects tail
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Price:
$10.99
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CURT 58040 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 60-Inch Wires
Splices into vehicle wiring to provide a connection for a trailer plug
4-way flat output connects tail
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Price:
$7.99
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CURT 58041 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 60-Inch Wires
Splices into vehicle wiring to provide a connection for a trailer plug
4-way flat output connects tail
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Price:
$11.99
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CURT 58345 Vehicle-Side 4-Pin Flat Trailer Wiring Harness
Splices into vehicle wiring to provide a connection to the trailer plug
4-way flat output connects tail lights, brake ligh
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Price:
$13.99
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CURT 58260 4-Pin Flat Trailer Wiring Towing Vehicle Socket Tester
Confirms proper function of vehicle-side wiring connector
Tests 4-way flat connection for tail lights, brake light
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Price:
$5.99
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CURT 58261 4-Pin Flat Trailer Wiring Towing Vehicle Socket Tester
Confirms proper function of vehicle-side wiring connector
Tests 4-way flat connection for tail lights, brake light
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Price:
$8.99
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Curt 4-Way Flat License Plate Light Plug Adapter #58404
Allows a 4-way flat socket to be mounted in a license plate light hole
1-1/4" plug fits a typical license plate light hole
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Price:
$6.95
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CURT 57404 4-Way Flat Vehicle-Side Trailer Wiring Adapter for 1-1/4-Inch License Plate Light Hole
Allows a 4-way flat socket to be mounted in a license plate light hole
1-1/4" plug
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Price:
$9.99
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CURT 58405 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 36-Inch Wires, Fits 1-1/4-Inch License Plate Light Hole
Splices into vehicle wiring to provide a connection for a trailer plug
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Price:
$7.99
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CURT 57405 Vehicle-Side 4-Pin Flat Trailer Wiring Harness with 36-Inch Wires, Fits 1-1/4-Inch License Plate Light Hole
Splices into vehicle wiring to provide a connection for a trailer
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Price:
$11.99
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CURT 58306 4-Way Flat Magnetic Connector Adapter
Easily converts your existing 4-way flat into magnetic quick-snap connection
Innovative design makes trailer wiring hookup fas
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Price:
$27.99
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CURT 57187 4-Way to 5-Way Flat Adapter for Boat Trailer Surge Brakes
Adapts vehicle 4-way flat to plug into boat trailer 5-way flat
Intended for boat trailers with surge brakes
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Price:
$14.99
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CURT 58980 4-Way Flat Vehicle-Side to 7-Way RV Blade Wiring Adapter, Dinghy Towing
Plugs into CURT RV harness 4-way to provide a 7-way RV blade socket
Unique design provides a stan
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Price:
$91.99
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CURT 57102 Dual-Output 4-Way Flat Vehicle-Side to 7-Way RV Blade Trailer Wiring Adapter with Backup Alarm
Adapts a 4-way flat socket to fit 4-way flat and 7-way RV blade trailer plugs
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Price:
$58.99
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CURT 57183 4-Way Flat Vehicle-Side to 6-Way Round Trailer Wiring Adapter
Adapts a 4-way flat vehicle socket to fit 6-way round trailer plugs
6-way connects tail, brake, turn signal
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Price:
$29.99
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CURT 57184 4-Way Flat Vehicle-Side to 7-Way RV Blade Trailer Wiring Adapter
Adapts a 4-way flat vehicle socket to fit 7-way RV blade trailer plugs
7-way connects tail, brake, rever
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Price:
$31.99
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CURT 56476 4-Way Flat Vehicle-Side to USCAR Wiring Adapter
Adapts 4-way flat vehicle socket to accept a USCAR connector
Enables installation of the Echo brake controller on 4-flat
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Price:
$51.99
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CURT 57185 4-Way Flat Vehicle-Side to 7-Way RV Blade Trailer Wiring Adapter
Adapts a 4-way flat vehicle socket to fit 7-way RV blade trailer plugs
7-way connects tail, brake, rever
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Price:
$33.99
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CURT 57676 4-Way Flat Vehicle-Side to 7-Way RV Blade Trailer Wiring Adapter with Tester
Adapts a 4-way flat vehicle socket to fit 7-way RV blade trailer plugs
Simple plug-and-play
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Price:
$46.99
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CURT OEM Replacement Dual-Output 7 & 4-Way Connector with Mounting Bracket, Packaged #57021
Plugs into any USCAR socket to provide 4-way and 7-way trailer wiring connectors
Sim
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Price:
$49.99