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

Retail: $29.60
Our Price: $22.17
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

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

Retail: $61.64
Our Price: $46.65
In Stock
This circuit tester plugs into the 7-way connector on your truck. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.Features: 7-way circuit tester 12V power Function Codes: BU: back up or reverse circuit center pole RT: right turn/brake TM: taillights LT: left turn/brake BK: brake controller output 12V: 12-volt power feed
  • Testers
  • Tow Function Tester
  • Circuit Tester
  • Pollak
  • Black

Brophy Circuit Tester for 4-Pole Flat Trailer Connector

Retail: $18.63
Our Price: $15.86
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
  • Circuit Tester
  • Tow Function Tester
  • Brophy
  • Black

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

Retail: $27.99
Our Price: $25.34
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.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. Molded grips make it easy to plug in and remove without tools.
  • Wiring Adapters
  • TowSmart
  • 4 Flat to 7 Blade
  • Universal Fit

Brophy 4- and 5- Way Flat Circuit Tester

Our Price: $23.05
In Stock
This Brophy electrical tester works for both 4- and 5- way flat trailer wiring harnesses.
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Brophy
  • Black

Hook Probe Circuit Tester

Our Price: $13.88
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.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

TowSmart Circuit Tester Kit for 4-Pole Flat Trailer Connector

Our Price: $14.46
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 waste an afternoon rewiring something that works.Highlights 4-Way Circuit Tester: Checks power output on standard 4-flat vehicle connectors. Instant LED Feedback: Lights up to show turn signals, brake lights, and running lights.
  • Testers
  • Tow Function Tester
  • Circuit Tester
  • TowSmart

Curt LED 5-Way Flat Circuit Tester - Vehicle End

Retail: $13.95
Our Price: $10.27
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

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

Retail: $28.89
Our Price: $23.26
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 makes for easy hookup.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 Flexible wire between plugs provides larger range of motion for more convenient hookup than with standard adapters Large, easy-pull grip design makes installing and removing the plug effortless Built-in cover and included grease packet help to protect the terminals from dust, grime and corrosion Cover also prevents grease from spreading all over during storage Specs: Distance between plugs: 5" 3-Year limited warranty This adapter allows the 7-way, RV-style, vehicle-end connector pictured on the left to work with the 4-way and 5-way, trailer-end connectors on the right.
  • Wiring Adapters
  • Hopkins
  • 7 Blade to 4 Flat
  • 7 Blade to 5 Flat
  • Universal Fit

LCD Digital Circuit Tester

Our Price: $27.95
In Stock
Features: Economy LCD Circuit Tester with LED back light Ideally used to detect power, voltage, ground, and circuit integrity Surge protected circuitry displays DC voltage from 3V to 48V (±0.3V accuracy) Conduct circuit tests with increased accuracy and ease LED indicates RED for power or GREEN for ground W2992 Performance Tool LCD Digital Circuit Tester
  • Testers
  • Circuit Tester
  • Performance Tool

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

Retail: $10.99
Our Price: $10.01
In Stock
... Time to swap the plug. This 4-way flat connector comes with a built-in tester and 24 inches of bonded wire. Splice it in, test the lights, and go.Weather-Resistant Housing: Helps protect against moisture and road grime. Features to know about Integrated Tester for Quick Diagnostics This 4-way flat trailer-end connector features a built-in wire tester, making it easy to confirm signal functions before you ever pull out of the driveway.
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 4 Flat

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

Our Price: $32.82
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. Textured Grip: Makes disconnecting easier, even in cold weather.
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 7 Blade

TowSmart Adapter 7 Pole to 4 Pole with Tester and Cover

Retail: $25.99
Our Price: $18.72
In Stock
Test, plug in, go. The LED tester confirms your wiring, then you connect from 7 Blade to 4 Flat so every signal is ready before you tow.Highlights Built-In LED Tester: Verifies wiring continuity at a glance. 7 Blade to 4 Flat: Adapts vehicle socket to trailer plug. Plug-In Setup: Connects without wiring.
  • Wiring Adapters
  • TowSmart
  • 7 Blade to 4 Flat
  • Universal Fit

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

Our Price: $16.09
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 connect even with cold hands. No guessing or wasted time.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. Color-Coded Leads: Matches standard trailer wiring functions. 12" Length: Ideal for short trailer-end runs or custom wiring setups.
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 4 Flat

TowSmart ProClass Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole

Retail: $24.99
Our Price: $20.25
In Stock
Test, check, connect. The built-in LED tester and adapter work together so your trailer's ready when you are.Highlights Built-In LED Tester: Verifies wiring continuity at a glance. Plug-In Setup: Connects without wiring. Signal Ready: Supports brake, turn, taillight, and ground signals. 6 Round to 4 Flat: Adapts a 6 Round trailer to a 4 Flat.
  • Wiring Adapters
  • TowSmart
  • 6 Round to 4 Flat
  • Universal Fit

Curt 6-Way Round LED Circuit Tester - Vehicle End

Retail: $16.95
Our Price: $11.48
In Stock
This circuit tester plugs into the 6-way connector on your vehicle. LED lights indicate which functions (brake, turn, tail, electric brakes, and 12V) are properly working.Features: 6-Way connector tester plugs into your vehicle's wiring harness to confirm your lights are functioning Tests tail lights, brake lights, turn signals, electric brakes, and auxiliary power Labeled LED lights indicate which functions are working properly
  • Testers
  • Tow Function Tester
  • Circuit Tester
  • CURT

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

Retail: $14.99
Our Price: $13.73
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, and you're back on schedule.Highlights 4-Way to 7-Blade Conversion: Adapts your vehicles 4-way flat to a 7-blade trailer connector. Plug-In Ready: No cutting or splicing needed. Built-In Wire Tester: Confirms function before towing. Weather-Resistant Housing: Helps protect against moisture and road grime. Secure Connection: Keeps trailer wiring locked in and stable during travel.
  • Wiring Adapters
  • TowSmart
  • 4 Flat to 7 Blade
  • Universal Fit

TowSmart Tester for 4-Pole Flat Trailer Connector

Our Price: $8.78
In Stock
Check, confirm, connect. The LEDs light up to show your wiring is ready before you pull out with the trailer.
  • Testers
  • Tow Function Tester
  • TowSmart

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

Our Price: $4.80
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

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

Retail: $15.49
Our Price: $12.86
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 frustration.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
  • TowSmart
  • 4 Flat

Cordless Circuit Tester

Our Price: $21.07
  • Testers
  • Circuit Tester
  • Performance Tool

TowSmart 12-Volt Probe Tester

Our Price: $9.84
Test 12-volt circuits quickly with this simple probe tester. The sharp probe tip and alligator clip help you check for power on trailer, towing, and vehicle wiring connections.Features: Tests 12-volt circuits to help confirm power at wiring connections Sharp probe tip makes it easier to check terminals, sockets, and other contact points Alligator clip attaches to a ground source for simple testing Great for basic troubleshooting on trailer, towing, and vehicle wiring Specs: Application: 12-volt electrical systems Type: Probe-style circuit tester Includes: Probe tester with attached wire lead and alligator clip
  • Testers
  • Circuit Tester
  • TowSmart

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

Our Price: $60.76
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. All that's left is to head out.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. Straight Wire Leads: Blunt-cut ends for splicing into existing wiring.
  • Trailer Connectors
  • Trailer End Connector
  • TowSmart
  • 7 Blade

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

Our Price: $14.43
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.
  • Wiring Extensions
  • Trailer and Vehicle End Connector
  • TowSmart
  • 4 Flat