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Hopkins Tow Doctor Vehicle End Test Unit - HM50918

Retail: $366.79
Our Price: $261.19
In Stock
  • Testers
  • Tow Function Tester
  • Hopkins

Curt LED 4-Way Flat Connector (Vehicle End) Tester

Retail: $10.49
Our Price: $6.23
In Stock
Curt LED 4-Way Flat Connector Tester This circuit tester plugs into the four-way trailer connector on the vehicle. The bright LED lights analyze the trailer connections and indicate which functions
  • Testers
  • Tow Function Tester
  • CURT
  • Black

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

Our Price: $21.63
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 ...
Features: Trailer light serves 7 functions Stop light Tail light Turn signal Side marker Side reflex reflector Rear clearance Rear reflex reflector Built-in test lights let you troubleshoot Tail and
  • 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: $19.98
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 ...
Features: Trailer light serves 6 functions Stop light Tail light Turn signal Side marker Side reflex reflector Rear reflex reflector Built-in test lights let you troubleshoot Tail and stop/turn LEDs
  • 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 Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit

Retail: $114.29
Our Price: $84.82
In Stock
The built-in tester on the 4-way flat in this kit lets you easily troubleshoot. Great for setups with LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your ...
Features: Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately) Ensures
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Hopkins
  • Splice-In
  • 4 Flat
  • Powered Converter
  • Universal Fit

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

Our Price: $11.55
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

New Arrivals — From Our Shop to You!

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.

Kenny
Kenny etrailer team member
Kenny etrailer team member

3

Years

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278

Installations

3,868

Customers Helped

Any questions? Chat us from Missouri

Hook Probe Circuit Tester

Retail: $25.50
Our Price: $12.11
In Stock
From under-dash tangles to trailer wiring headaches, this circuit tester helps you zero in on electrical issues fast. It hooks on, lights up, and powers through the job without slowing you down.: Electrical systems: 6V and 12V DC Compatible with cars, trucks, trailers, and motorcycles Tester Type: Wire-piercing molded hook probe Test Lead: Length: 4 feet Insulated, oil and heat-resistant cord Lighting
  • Testers
  • Circuit Tester
  • Performance Tool

Hopkins Endurance Easy-Pull 4-Way Flat Connector w/ 48" Harness and LED Tester

Retail: $20.43
Our Price: $10.57
In Stock
Built-in LEDs on this 4-way flat connector help you troubleshoot problems. The large grip ring provides the leverage you need to easily disconnect it from your trailer connector without damaging the ...
connector is receiving power from your tow vehicle. Just plug the connector into the 4-way flat on your trailer. No separate circuit testers are needed. Activate each function on your vehicle and a red light
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Hopkins
  • Splice-In
  • 4 Flat
  • No Converter
  • Universal Fit

TowSmart Circuit Tester Kit for 4-Pole Flat Trailer Connector

Our Price: $11.97
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

Replacement Tow Doctor Tester

Retail: $637.69
Our Price: $293.15
, left turn, brake, tail, backup lights; electric brakes and auxiliary power Trailer lights illuminate and LED bulbs light on the tester to show function operation Adapts to 4-Flat, 6-Pole Round, or 7-Way
  • Testers
  • Tow Function Tester
  • Hopkins

Tekonsha Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit

Our Price: $120.78
In Stock
Great for cars and trailers with either LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your trailer's. It includes a 4-way flat, wire taps, and a power ...
Features: Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately) Ensures
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Tekonsha
  • Visible
  • Splice-In
  • 4 Flat
  • Powered Converter
  • Universal Fit

Tekonsha Tail Light Converter with 4-Way Flat Trailer Connector and Install Kit

Our Price: $36.05
In Stock
Great for cars and trailers with either LED or incandescent bulbs, this tail light converter has a 60" 4-way flat harness. Designed for vehicles that have amber turn signals. Includes wire taps ...
Features: Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights Compatible with 5-pole, 6-pole, and 7-pole adapaters (sold separately) Ensures
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Tekonsha
  • Hidden
  • Splice-In
  • 4 Flat
  • Converter
  • Universal Fit

Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit

Our Price: $162.83
In Stock
Great for cars and trailers with either LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your trailer's. It includes a 4-way flat, wire taps, and a power ...
Features: Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately) Ensures
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • CURT
  • Splice-In
  • 4 Flat
  • Powered Converter
  • Universal Fit

Tekonsha Trailer Wiring Circuit Tester

Retail: $690.99
Our Price: $442.53
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 ...
Features: Helps to quickly identify problems in your trailer wiring Tests the left turn, right turn, tail/marker, brake and reverse light circuits on the trailer Works with incandescent and LED
  • Testers
  • Circuit Tester
  • Tekonsha

Brophy Circuit Tester for 4-Pole Flat Trailer Connector

Our Price: $14.84
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 Powered Tail Light Converter w/ 4-Way Flat Trailer Connector for Negative Input Vehicles

Retail: $106.09
Our Price: $78.44
In Stock
Convert your vehicle's lighting system to match that of your trailer with this kit. It includes a 60" 4-way flat harness, wire taps, and a power wire that pulls power directly from your ...
Features: Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights Compatible with 5-pole, 6-pole, and 7-pole adapters Ensures that your
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Hopkins
  • Splice-In
  • 4 Flat
  • Powered Converter
  • Universal Fit

Curt LED 5-Way Flat Circuit Tester - Vehicle End

Retail: $12.95
Our Price: $10.67
In Stock
This circuit tester plugs into the 5-way trailer connector on your vehicle. The bright LED lights indicate which functions (tail lights, brake lights, turn signals, and reverse lights) are working ...
Features: 5-Way connector tester plugs into your vehicle's wiring harness to confirm your lights are functioning Tests tail lights, brake lights, turn signals, and reverse lights Labeled LED
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • CURT

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

Retail: $59.99
Our Price: $49.00
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 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

Modulite Circuit Protected Power Converter w/ 5-Way Flat, Hardwire Kit, and Tester

Our Price: $72.54
In Stock
Modulite Protector with Integrated Circuit & Overload Protection, Hardwire Kit and Tester that use a pulse width modulation (PWM); this gives the trailer lights full brightness Double-sided tape for mounting Draws power directly from the tow vehicle battery; uses less than 5 milliamps of the
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Tekonsha
  • Splice-In
  • 5 Flat
  • Powered Converter
  • Universal Fit

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

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

Retail: $15.49
Our Price: $14.34
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

Hopkins Smart Light Trailer Tail Light w Test Lights - 8 Function - Submersible - Driver's Side

Our Price: $23.68
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 ...
; respectively) are the testers for the stop/turn and tail light functions. If both of these LEDs light up, and the trailer light illuminates as well, then everything is working correctly and you're ready to
  • Tail Lights
  • Rear Clearance
  • License Plate
  • Stop
  • Side Reflector
  • Tail
  • Rear Reflector
  • Turn
  • Side Marker
  • Hopkins
  • Red
  • 4-1/2L x 5-3/8W Inch
  • Submersible Lights
  • Square
  • Surface Mount

Hopkins Smart Light Trailer Tail Light w Test Lights - 7 Function - Submersible - Driver's Side

Retail: $50.53
Our Price: $20.93
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 ...
Features: Trailer light serves 7 functions Stop light Tail light Turn signal Side marker Side reflex reflector Rear reflex reflector License plate light Built-in test lights let you troubleshoot Tail
  • Tail Lights
  • License Plate
  • Side Reflector
  • Side Marker
  • Turn
  • Stop
  • Rear Reflector
  • Tail
  • Hopkins
  • Red
  • 4-1/2L x 5-3/8W Inch
  • Submersible Lights
  • Square
  • Surface Mount