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

Our Price: $21.03
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. ...
The top and center LEDs (labeled "S" and "T" 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 tow.
  • Tail Lights
  • Square
  • Red
  • 4-1/2L x 5-3/8W Inch
  • Brake/Tail/Turn
  • Marker
  • Submersible Lights
  • Surface Mount
  • Hopkins

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

Retail: $36.99
Our Price: $30.11
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 everything works.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 install.
  • Trailer Connectors
  • Trailer End Connector
  • 7 Blade
  • TowSmart

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

Our Price: $10.59
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 bonded wire. ...
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 install.
  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • TowSmart

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

Our Price: $58.89
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 good. ...
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 harness protects against wear.
  • Trailer Connectors
  • Trailer End Connector
  • 7 Blade
  • TowSmart

TowSmart Circuit Tester Kit for 4-Pole Flat Trailer Connector

Our Price: $15.04
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. ...
Fast Diagnostics: Helps isolate wiring or fuse issues in seconds. Features to know about Quick Test for 4-Flat 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 to confirm power at each pin.
  • Testers
  • Tow Function Tester
  • Circuit Tester
  • TowSmart

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

Our Price: $168.72
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 wire that pulls power directly from your battery.This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.
  • Trailer Hitch Wiring
  • Powered Converter
  • Splice-In
  • Vehicle End Connector
  • 4 Flat
  • Universal Fit
  • CURT

Brophy Circuit Tester for 4-Pole Flat Trailer Connector

Our Price: $17.24
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 LED lights indicate which functions are working properly Tail: tail lights LT: left turn signal and brakes RT: right turn signal and brakes
  • Testers
  • Black
  • Circuit Tester
  • Tow Function Tester
  • Brophy

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

Retail: $27.99
Our Price: $24.09
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 load up and hit the road.Features to know about Quick Adapter with Signal Check This TowSmart ProClass adapter 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 active.
  • Wiring Adapters
  • 4 Flat to 7 Blade
  • Universal Fit
  • TowSmart

TowSmart ProClass Quick Pull 4-Pole Flat Extension- Vehicle and Trailer Ends - LED Tester - 12"

Our Price: $15.15
You are hooking up before an early start and want to be sure everything works. You plug in, glance at the LED indicators, and know right away your connection is solid. You pull away confident your signals will respond when you need them.Highlights 12-Inch Extension Loop: Adds reach between vehicle and trailer. 4-Way Flat Connectors: Plugs into standard vehicle and trailer ends. LED Connection Indicators: Red lights verify power and function.
  • Wiring Extensions
  • Trailer and Vehicle End Connector
  • 4 Flat
  • TowSmart

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

Our Price: $15.67
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 connect even with cold hands. ...
Color-Coded Leads: Matches standard trailer wiring functions. 12" Length: Ideal for short trailer-end runs or custom wiring setups. Features to know about 4-Flat Harness with Built-In Circuit Check This trailer-end 4-way harness includes integrated LEDs that light up when each function is powered.
  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • TowSmart

Tekonsha Trailer Wiring Circuit Tester

Retail: $690.99
Our Price: $453.66
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 lights Indicates approximate amount of current in each circuit Determines faults in each circuit, such as no load, overload, short, or low battery Monitors the voltage of the external battery (trailer battery) connected to the trailer charge circuit Includes charger for the internal battery of the trailer tester Works with 7-way trailer connector Adapters (sold separately) allow use with 4-pole, 5-pole 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 Tester for 4-Pole Flat Trailer Connector

Retail: $9.99
Our Price: $8.16
Check, confirm, connect. The LEDs light up to show your wiring is ready before you pull out with the trailer.Highlights 4 Wire Flat Design: Tests standard 4 Wire Flat vehicle connectors. LED Indicators: Lights show active brake, turn, and tail signals. Quick Check: Confirms proper wiring before towing. Simple Use: Plugs directly into vehicle connector.
  • Testers
  • Tow Function Tester
  • TowSmart

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

Our Price: $86.13
In Stock
Built to last, this kit, made with surface-mount technology, converts your vehicle's lighting system to match your trailer's. It includes a 60" 4-way flat harness, wire taps, and a power wire that pulls power directly from your battery.This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.
  • Trailer Hitch Wiring
  • Powered Converter
  • Splice-In
  • Vehicle End Connector
  • 4 Flat
  • Universal Fit
  • CURT

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

Our Price: $79.20
In Stock
Built to last, this kit, made with surface-mount technology, converts your vehicle's lighting system to match your trailer's. It includes a 60" 4-way flat harness, wire taps, and a power wire that pulls power directly from your battery.This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.
  • Trailer Hitch Wiring
  • Converter
  • Visible
  • Splice-In
  • Vehicle End Connector
  • 4 Flat
  • Universal Fit
  • CURT

Curt Tail Light Converter with 4-Way Flat Trailer Connector

Retail: $48.93
Our Price: $29.38
In Stock
Built to last, this tail light converter with a 76" 4-way flat harness is made using surface-mount technology. Designed for vehicles that have amber turn signals and incandescent bulbs. ...
This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.
  • Trailer Hitch Wiring
  • Powered Converter
  • Splice-In
  • Vehicle End Connector
  • 4 Flat
  • Universal Fit
  • CURT

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

Retail: $15.02
Our Price: $13.53
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. ...
Secure Connection: Keeps trailer wiring locked in and stable during travel. Features to know about Test and Tow With 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.
  • Wiring Adapters
  • 4 Flat to 7 Blade
  • Universal Fit
  • TowSmart

Performance Tool W2973C 6/12V Circuit Tester 'n Probe Light for Cars, Trucks, Tractors & RVs

Retail: $6.95
Our Price: $3.53
In Stock
Quickly check circuits and wire function with this Performance Tool 6 to 12V tester. Designed for automotive electrical systems, it features an insulated piercing probe and an alligator-clip lead for secure, hands-free testing on 6V and 12V setups.Features: Compatible with 6-volt and 12-volt DC systems Insulated probe safely pierces wire insulation for in-line circuit testing Attached test lead includes an alligator clip for quick grounding Ideal for diagnosing automotive wiring, fuses, and electrical functions Specs: Application: Automotive 6V and 12V electrical systems Tester type: Piercing probe circuit tester Test lead: Integrated with alligator clip
  • Testers
  • Circuit Tester
  • Performance Tool

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

Retail: $25.22
Our Price: $10.49
In Stock
... The large grip ring provides the leverage you need to easily disconnect it from your trailer connector without damaging the terminals. Includes dust cover.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 will come on if power for that function is being sent by the vehicle-end connector to the trailer-end connector.
  • Trailer Hitch Wiring
  • No Converter
  • Splice-In
  • Vehicle End Connector
  • 4 Flat
  • Universal Fit
  • Hopkins

Trailer Mate Custom Tail Light Wiring Kit for Towed Vehicles

Our Price: $50.94
In Stock
Quickly and easily connect your towed car's lighting system to your RV to activate the signal lights required for towing. This custom harness plugs directly into your towed vehicle's existing wiring - no cutting or splicing required.You have to position and mount multiple diodes beneath your car and then splice into the vehicle's wiring. Before cutting and splicing, though, you have to use a circuit tester to identify each wire. This must be done for the wires carrying signals from your running lights, brake lights, and both turn signal lights.
  • Trailer Hitch Wiring
  • Powered Converter
  • Plug-In
  • Vehicle End Connector
  • 4 Flat
  • No Tow Package
  • Trailer Mate

Hook Probe Circuit Tester

Retail: $26.00
Our Price: $13.69
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.Extra Reach When You Need It The 4' insulated cord gives you the flexibility to reach tight spots like under the dash or near the trailer tongue. It holds up to heat, oil, and grime, staying reliable through real-world garage conditions. Specs Application: 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: High-intensity bulb for clear visual feedback Warranty: 1-year limited
  • Testers
  • Circuit Tester
  • Performance Tool

Curt LED 5-Way Flat Circuit Tester - Vehicle End

Retail: $13.95
Our Price: $9.44
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 properly and which are not.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 lights indicate which functions are working properly Can be left attached to the circuit to continuously monitor the line between your vehicle and the trailer lighting systems Dust cover keeps connector clean when not in use
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • CURT

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

Retail: $15.49
Our Price: $14.50
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. ...
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, flexible lead for testing or temporary wiring.
  • Trailer Connectors
  • Trailer and Vehicle End Connector
  • 4 Flat
  • TowSmart

Brophy 4- and 5- Way Flat Circuit Tester

Retail: $23.15
Our Price: $21.33
In Stock
This Brophy electrical tester works for both 4- and 5- way flat trailer wiring harnesses.Features: 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 Can be left attached to the circuit to continuously monitor the line between your vehicle and the trailer lighting systems
  • Testers
  • Black
  • Circuit Tester
  • Tow Function Tester
  • Brophy

Curt 7-Way to RV Socket LED Circuit Tester - Vehicle End

Our Price: $20.73
In Stock
This circuit tester plugs into the 7-way connector on your vehicle. LED lights indicate which functions (brake, turn, tail, stop, reverse, electric brakes, and 12V) are properly working. ...
Features: 7-Way connector tester plugs into your vehicle's wiring harness to confirm your lights are functioning Tests tail lights, brake lights, turn signals, reverse lights, electric brakes, and auxiliary power Labeled LED lights indicate which functions are working properly Color-coded LEDs make it easy to distinguish each vehicle signal Integraded resistors are compatible with Smart Tow
  • Testers
  • Tow Function Tester
  • Circuit Tester
  • CURT