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Tekonsha Trailer Wiring Circuit Tester

Our Price: $356.80
In Stock
This tester helps you to quickly identify problems in your trailer wiring. It tests the left turn, right turn, tail/marker, brake and backup circuits to indicate the level of current in each circuit ...
and 6-pole connectors 1-Year limited warranty This diagram illustrates the error codes that the trailer tester will display if it detects faults in the currents of your trailer wiring.
  • Testers
  • Circuit Tester
  • Tekonsha

TowSmart 4-Way Flat Trailer Connector w/ Wire Tester - Trailer End - 24"

Retail: $10.99
Our Price: $9.73
In Stock
The trailer lights are flickering again. You've replaced bulbs, checked grounds, and still no luck. Time to swap the plug. This 4-way flat connector comes with a built-in tester and 24 inches of ...
Highlights 4-Way Flat Plug: Standard trailer-end connector. 24" Bonded Wire Lead: 18-gauge wire for stop, turn, and taillights. Built-In Wire Tester: Lets you verify light function during
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 4 Flat

TowSmart ProClass 7-Blade Trailer Connector w/ Wire Tester - Trailer End

Retail: $36.99
Our Price: $27.17
You're wiring up a trailer and need to know it's done right. This 7-way plug lights up to show which signals are live the second you connect. You crimp it, test it, and roll out knowing ...
Highlights 7-Blade Connector: Standard trailer-end plug for lights, brakes, and power. Built-In LED Tester: Confirms active signals during hookup. Screw Terminals: Accepts blunt-cut wires for easy
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 7 Blade

TowSmart ProClass 7-Blade Trailer Connector w/ Jacketed Cable, Wire Tester - 72" Long

Retail: $59.99
Our Price: $51.48
In Stock
You're rewiring a trailer from scratch or cleaning up a mess of splices. This 7-way gives you a fresh cable, sealed jacket, and built-in test lights. You wire it once, plug it in, and know its ...
Highlights 7-Blade Connector: Standard plug for trailer lights, brakes, and 12V power. LED Tester Built In: Lights confirm signal function during hookup. Jacketed Cable: Sealed 72" wiring
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 7 Blade

TowSmart Plug-In Trailer Connector Adapter w/ Wire Tester - 4-Way Flat to 7-Blade

Our Price: $14.34
In Stock
You're lining up the trailer in the driveway when you realize the plug doesn't match. No time to rewire. You grab the adapter, plug it in, and the lights fire up. Quick fix, solid connection ...
Confidence The built-in LED tester lets you check your trailer wiring before you hit the road, so you can catch any issues early and tow safely. Specs Connector Type: Vehicle side: 4-way flat Trailer side
  • Wiring Adapters
  • TowSmart
  • 4 Flat to 7 Blade
  • Universal Fit

TowSmart ProClass Plug-In Trailer Connector Adapter w Wire Tester, Ergo Grip - 4-Way Flat to 7-Blade

Retail: $27.99
Our Price: $23.67
In Stock
You've got a 4-flat on the vehicle and a 7-way on the trailer. No time to rewire. You grab this adapter, plug it in, and the built-in lights confirm the signals are live. Now you just need to ...
converts your 4-flat vehicle wiring to fit a 7-way trailer plug. It's a plug-and-play solution for light-duty towing. The built-in LED tester confirms that brake lights, taillights, and turn signals are
  • Wiring Adapters
  • TowSmart
  • 4 Flat to 7 Blade
  • Universal Fit

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Chosen by folks who live and breathe this, just like you.

New Arrivals — From Our Shop to You!

Chosen by folks who live and breathe this, just like you.

Kristin
Kristin etrailer team member
Kristin etrailer team member

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TowSmart Harness with 4-Pole Flat Connector - Wire Tester, Ergo Grip - Trailer End - 12"

Our Price: $14.45
In Stock
You're hooking up the trailer and the lights are dead. Could be the truck, could be the plug. This harness tells you fast. Built-in LEDs show what's live, and the grip makes it easy to ...
Highlights 4-Way Flat Connector: Standard trailer-end wiring harness. Built-In LED Tester: Confirms active signals during hookup. Ergo Grip Handle: Makes connecting and disconnecting easier
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 4 Flat

Hopkins Vehicle Wiring Converter with 4-Pole End - Includes Tester and Connectors

Retail: $41.59
Our Price: $29.67
Converter adapts a 3-wire system into a 2-wire system Includes (1) Circuit tester to help find the correct wires (4) Quick splices to connect the wire harness to the vehicle Rated at 2.1 amps per
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Hopkins
  • Plug-In
  • 4 Flat
  • No Converter
  • Universal Fit

TowSmart 4-Pole Loop w/ Wire Tester - 12" Long

Retail: $15.49
Our Price: $14.45
In Stock
You're sorting out a trailer light issue and don't want to rip everything apart. This loop lets you test wiring fast. Plug it in, check the LEDs, and see what's working. Saves time and ...
Highlights 4-Way Flat Loop: Connects trailer and vehicle wiring or serves as a test lead. Built-In LED Tester: Lights indicate active circuits when plugged into vehicle. 12" Length: Short
  • Trailer Connectors
  • Trailer and Vehicle End Connector
  • TowSmart
  • 4 Flat

ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit

Our Price: $176.98
In Stock
Install a 4-way trailer connector on your vehicle without cutting or splicing into your wiring. Zero-contact interface sensors identify the current flowing through each wire by simply clamping onto ...
with, and no power draw from your vehicle's wiring system Easily removable and transferrable between different vehicles Circuit tester included to ensure proper setup Includes circuit-protected
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Tekonsha
  • Hidden
  • Plug-In
  • 4 Flat
  • Converter
  • Universal Fit

Reese Trailer Connector Adapter w/ LED Circuit Tester and Dust Cover - 7-Pole to 4-Pole or 5-Pole

Retail: $31.30
Our Price: $24.22
This adapter lets you quickly convert your 7-way connector for use with a 4-way or 5-way flat trailer-end plug. It includes a circuit tester with red LEDs and a built-in dust cover that protects the ...
Features: Easy-to-use, plastic adapter converts your vehicle's 7-blade, RV-style, vehicle-end connector for use with a 4-wire or 5-wire flat, trailer-end connector Circuit tester with highly
  • Wiring Adapters
  • Reese
  • 7 Blade to 4 Flat
  • 7 Blade to 5 Flat
  • Universal Fit

Curt 4-Way Flat Trailer Connector w/ 60" Harness and Wire Taps

Our Price: $19.12
In Stock
Quick-splice wire taps let you splice this 4-way flat trailer connector into your vehicle. Bonded wires are color coded to make installation a little easier. 1 reason trailer wiring comes up faulty is a bad ground, so make sure your ground wire has a solid and clean connection to metal. To make this connection, you'll need a self-tapping screw and a
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • CURT
  • Splice-In
  • 4 Flat
  • No Converter
  • Universal Fit

Hopkins Endurance Easy-Pull Harness with 4-Pole Flat Connector - LED Tester - Trailer End - 12"

Retail: $23.96
Our Price: $8.82
In Stock
... verify power. Splices into your trailer's wiring. Labeled for each function on your vehicle Simple installation - hardwire to existing trailer wiring Corrosion-resistant terminals are long-lasting Specs: Ring inner diameter: 1" Ring outer diameter
  • Trailer Connectors
  • Trailer End Connector
  • Hopkins
  • 4 Flat

ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit

Retail: $276.00
Our Price: $167.19
In Stock
Install a 4-way trailer connector on your vehicle without cutting or splicing into your wiring. Zero-contact interface sensors identify the current flowing through each wire by simply clamping onto ...
with, and no power draw from your vehicle's wiring system Easily removable and transferrable between different vehicles Circuit tester included to ensure proper setup Includes circuit-protected
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Tekonsha
  • Hidden
  • Plug-In
  • 4 Flat
  • Powered Converter
  • Universal Fit

TowSmart Trailer Connector Adapter w/ LED Illuminator - 7-Wire to 4-Wire Flat

Our Price: $14.42
In Stock
You're lining up the trailer in the driveway when you realize the plug doesn't match. No time to rewire. You grab the adapter, snap it into place, and the lights fire up. Quick fix, solid ...
Confirmation This adapter converts your vehicle's 7-way blade socket to a 4-way flat plug, allowing you to tow trailers with different wiring configurations. The built-in LED illuminator lights up when the
  • Wiring Adapters
  • TowSmart
  • 7 Blade to 4 Flat
  • Universal Fit

Trailer Mate Custom Tail Light Wiring Kit for Towed Vehicles

Our Price: $50.95
In Stock
... wiring - no cutting or splicing required. separately) may be required if used with supplemental braking system Limited lifetime warranty Wiring Your Towed Vehicle with Trailer Mate Typically, wiring your vehicle for flat towing is a tremendous chore
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Trailer Mate
  • Plug-In
  • 4 Flat
  • Powered Converter
  • No Tow Package

Hopkins Endurance Easy-Pull 4-Pole Flat Extension - Vehicle and Trailer Ends - LED Tester - 12"

Our Price: $13.48
In Stock
Increase the length of your 4-way flat connection by 12" with this extension loop. Large grip ring on trailer end provides maximum leverage when disconnecting. Built-in LED lights illuminate to ...
Features: 4-Way flat extension loop increases the length of your wiring connection by 12" Plugs into the 4-way flat connectors on your vehicle and trailer Easy-to-pull ring on trailer end makes
  • Wiring Extensions
  • Hopkins
  • Splice-In
  • 4 Flat
  • No Converter
  • Universal Fit

Hopkins Smart Light Trailer Tail Light w Testers - 7 Function - Submersible - Passenger's Side

Our Price: $21.73
In Stock
4-1/2" x 5-3/8" Square trailer tail light is submersible. Integrated LEDs indicate if there's a fault in your trailer wiring. For trailers more than 80" wide. Includes ...
Smart Light makes it easy to diagnose faults in your trailer wiring. The Smart Light has 3 separate LEDs on the side of the unit that act as test lights. These LEDs allow you to see if the tail light is
  • Tail Lights
  • Side Marker
  • License Plate
  • Rear Reflector
  • Turn
  • Tail
  • Stop
  • Side Reflector
  • Hopkins
  • Red
  • 4-1/2L x 5-3/8W Inch
  • Submersible Lights
  • Square
  • Surface Mount

Hopkins Smart Light Trailer Tail Light w Testers - 6 Function - Submersible - Passenger's Side

Our Price: $19.93
In Stock
4-1/2" x 5-3/8" Square trailer tail light is submersible. Integrated LEDs indicate if there's a fault in your trailer wiring. For trailers less than 80" wide. Includes ...
makes it easy to diagnose faults in your trailer wiring. The Smart Light has 3 separate LEDs on the side of the unit that act as test lights. These LEDs allow you to see if the tail light is receiving
  • Tail Lights
  • Stop
  • Side Reflector
  • Rear Reflector
  • Turn
  • Side Marker
  • Tail
  • Hopkins
  • Red
  • 4-1/2L x 5-3/8W Inch
  • Submersible Lights
  • Square
  • Surface Mount

Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 7-Pole to 4-Pole or 5-Pole

Retail: $43.40
Our Price: $23.61
In Stock
This adapter lets you use your 7-way, RV-style connector with a 4- or 5-way flat, trailer-end plug. It includes a circuit tester with red LEDs, and the 5" long, flexible wire between the plugs ...
Features: Adapter converts your 7-pole, blade-style, vehicle-end connector to a 4- or 5-wire flat connector Integrated circuit tester with red LEDs lets you know when wiring is functioning properly
  • Wiring Adapters
  • Hopkins
  • 7 Blade to 4 Flat
  • 7 Blade to 5 Flat
  • Universal Fit

Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole

Retail: $37.24
Our Price: $22.85
In Stock
This adapter lets you use your 6-way round connector with a 4-way flat, trailer-end plug. It includes a circuit tester with red LEDs, and the 5" long, flexible wire between the plugs makes for ...
Features: Adapter converts your 6-pole round, vehicle-end connector to a 4-wire flat connector Integrated circuit tester with red LEDs lets you know when wiring is functioning properly Flexible wire
  • Wiring Adapters
  • Hopkins
  • 6 Round to 4 Flat
  • Universal Fit

TowSmart Circuit Tester Kit for 4-Pole Flat Trailer Connector

Our Price: $12.50
In Stock
You're chasing a light issue with no clue if it's the truck or trailer. You plug in the tester, hit the blinkers, and the LEDs show what's live. No guesswork. Just answers before you ...
Trailer Wiring This compact plug-in tester helps you verify that your tow vehicles 4-way flat connector is working correctly. Plug it in, activate the lights in the cab, and the built-in LEDs will light up
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • TowSmart

Brophy Circuit Tester for 4-Pole Flat Trailer Connector

Our Price: $15.35
In Stock
Circuit tester plugs into your 4-way flat trailer wiring harness and identifies lighting problems. Labeled LED lights illuminate to show which functions are working properly.Features: Circuit tester plugs into your trailer's wiring harness to check the conductivity of all the circuits between your vehicle and your trailer Quickly identifies lighting problems Labeled
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Brophy
  • Black

Hopkins Trailing Wiring Installation Kit with Circuit Tester and 4-Way Flat Dust Cover

Retail: $21.12
Our Price: $15.95
In Stock
Ideal for rewiring a trailer, this kit contains a 6-12-V LED circuit tester, connectors, ring terminals, zip-ties, ground screws, and more.Features: Trailer wiring installation kit is ideal for Y-harness and 4-conductor wire installation Includes the basics for rewiring or hardwiring a trailer connector to your trailer (1) 6-12-V LED
  • Tools for Wiring
  • Wiring Kits
  • Hopkins
  • Installation Kit