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Hopkins Tow Doctor Trailer End Test Unit
Hopkins Electrical Tools

(44 reviews)


Code: HM50928

Retail: $637.69
Our Price: $503.47
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Hopkins


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

(127 reviews)


Code: C73NR

Retail: $30.42
Our Price: $19.90
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • CURT


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. Color-coded LEDs make it easy to distinguish each signal.

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Tekonsha Trailer Wiring Circuit Tester
Tekonsha Electrical Tools

(13 reviews)


Code: 8010

Retail: $690.99
Our Price: $408.39
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Tekonsha


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. It also tests the voltage of the trailer battery.

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

(151 reviews)


Code: PK12741

Retail: $59.17
Our Price: $31.87
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Black
  • Pollak


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.

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7 Way Trailer Connector Vehicle Tester
Tow Ready Electrical Tools

(225 reviews)


Code: TR20117

Retail: $22.94
Our Price: $18.75
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Black
  • Tow Ready


A circuit tester that plugs into the 7-way trailer connector on the vehicle and emulates a trailer. The lights let you know what functions (brake, turn, tail, stop, reverse and 12V) are working properly and what functions are not.

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Hopkins Tow Doctor Vehicle End Test Unit
Hopkins Electrical Tools

(44 reviews)


Code: HM50918

Retail: $366.79
Our Price: $281.32
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Hopkins


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Powerbuilt Trim Pad Remover
Powerbuilt Electrical Tools

(555 reviews)


Code: ALL648544

Retail: $25.14
Our Price: $16.85
In Stock
  • Electrical Tools
  • Fastening Tools
  • Trim Removal Tool
  • Chrome
  • Powerbuilt


The trim pad remover is perfect for easily prying up plastic or metal trim fasteners to safely open up panels in your vehicle. The contoured handle allows easy access to fasteners. The trim pad remover helps to prevent blemishes on surfaces.

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Brophy Circuit Tester for 4-Pole Flat Trailer Connector
Brophy Electrical Tools

(291 reviews)


Code: F4CT

Our Price: $14.63
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Black
  • Brophy


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.

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Tekonsha 7-Way, RV-Style Tester for Brake Controllers - LED Test Lights
Tekonsha Electrical Tools

(115 reviews)


Code: 6562

Retail: $61.75
Our Price: $50.47
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Black
  • Tekonsha


Use this tester to check the connection between your tow vehicle's 7-pole, blade-style connector and your brake controller. Tester emulates trailer to confirm connectivity. LED lights illuminate to show each function is working.

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Wire Loom, 3/8" Diameter, 10' Long
Hopkins Electrical Tools

(120 reviews)


Code: 39035

Our Price: $7.34
In Stock
  • Electrical Tools
  • Wiring Protection
  • Wire Loom
  • 3/8 Inch Diameter
  • Hopkins


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Composite Trim Removal Tool Kit - 5 Piece
Performance Tool Electrical Tools

(74 reviews)


Code: PT73HJ

Our Price: $17.36
In Stock
  • Electrical Tools
  • Fastening Tools
  • Trim Removal Tool
  • Nylon
  • Performance Tool


This 5-piece set includes tools for removing internal or external trim and molding fasteners. Anti-marring design helps prevent damage to your vehicle's paint, upholstery, chrome, or finish.

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

Code: PT72PJ

Our Price: $6.50
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Performance Tool


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.

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Wire Loom 1/4" Diameter, 10' Long
Spectro Electrical Tools

(286 reviews)


Code: 7509-10

Our Price: $8.74
In Stock
  • Electrical Tools
  • Wiring Protection
  • Wire Loom
  • 1/4 Inch Diameter
  • Spectro


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Insulated Clamp Kit - 1/4" Diameter Mounting Hole - 42 Pieces
Performance Tool Electrical Tools

(10 reviews)


Code: PT43VR

Retail: $49.51
Our Price: $22.77
In Stock
  • Electrical Tools
  • Wire Protection
  • Wire Clips and Clamps
  • Black
  • Performance Tool


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CE Smith Trailer Wiring Clips - Frame Mount - Zinc Plated Steel - Qty 10
CE Smith Electrical Tools

(223 reviews)


Code: CE16867A

Retail: $13.08
Our Price: $9.27
In Stock
  • Electrical Tools
  • Cable Management
  • Wire Clips and Clamps
  • Silver
  • CE Smith


Corrosion-resistant clips help you secure loose wires on your trailer. Use them to supplement the clips in a wiring kit or to replace old worn-out clips. Fits around edges up to 5/32" thick.

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Hook Probe Circuit Tester
Performance Tool Electrical Tools

(58 reviews)


Code: PTW2993

Our Price: $12.11
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Performance Tool


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.

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Deka Self-Fusing Auto Tape - Black - 10' Roll - Qty 1
Deka Electrical Tools

(34 reviews)


Code: DW04367

Retail: $25.89
Our Price: $14.00
In Stock
  • Electrical Tools
  • Cable Management
  • Wire Protection
  • Electrical Tape
  • 10 Feet Long
  • Black
  • Deka


This black self-fusing tape is ideal for almost any application requiring a waterproof seal and is an excellent insulator with high dielectric strength.

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Wire Loom, 1/2" Diameter (per Foot)
Spectro Electrical Tools

(286 reviews)


Code: 459075-1

Our Price: $2.59
In Stock
  • Electrical Tools
  • Wiring Protection
  • Wire Loom
  • 1/2 Inch Diameter
  • Spectro


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LCD Digital Circuit Tester
Performance Tool Electrical Tools

(23 reviews)


Code: PTW2992

Retail: $38.72
Our Price: $26.98
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Performance Tool


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Brophy 4- and 5- Way Flat Circuit Tester
Brophy Electrical Tools

(291 reviews)


Code: F5CT

Retail: $23.58
Our Price: $21.33
In Stock
  • Electrical Tools
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Black
  • Brophy


This Brophy electrical tester works for both 4- and 5- way flat trailer wiring harnesses.

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on Electrical Tools

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for Electrical Tools

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7-Way Adapter for Hopkins Tow Doctor Trailer End Test Unit
Hopkins Electrical Tools

(4 reviews)


Code: HM4010509031

Our Price: $58.59
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Hopkins


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Primary Wire Heat-Shrinkable Tubing - 14-10 Gauge - Black - 3/16" Diameter - 6" - Qty 25
Deka Electrical Tools

(89 reviews)


Code: DW05449

Retail: $6.50
Our Price: $5.94
In Stock
  • Electrical Tools
  • Wire Protection
  • Heat Shrink Tubing
  • 3/16 Inch Diameter
  • 6 Inch Long
  • Black
  • Deka


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Primary Wire Heat-Shrinkable Tubing - 18-14 Gauge - Black - 1/8" Shrink Diameter - 6" Long
Deka Electrical Tools

(89 reviews)


Code: DW05451

Our Price: $5.94
In Stock
  • Electrical Tools
  • Wire Protection
  • Heat Shrink Tubing
  • 1/8 Inch Diameter
  • 6 Inch Long
  • Black
  • Deka


More Information >



7-Pole, Round-Pin Adapter for Hopkins Tow Doctor Vehicle-End Test Unit
Hopkins Electrical Tools

(2 reviews)


Code: HM50944

Retail: $73.55
Our Price: $54.28
In Stock
  • Electrical Tools
  • Testers
  • Tow Function Tester
  • Black
  • Hopkins


This adapter lets you test a 7-way, round-pin, vehicle-end connector to ensure that all the wiring functions are working properly. Plugs into the extension cord on your Hopkins Tow Doctor wire harness tester (HM50918; sold separately).

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Essential Electrical Tools for Every Enthusiast

Electrical tools are indispensable for diagnosing and fixing wiring issues, whether you're working on trailers, vehicles, or home projects. From testers that quickly identify wiring problems to couplers that simplify trailer connections, these tools save time and ensure safety. Consider the tool's portability, compatibility, and ease of use when choosing the right one for your needs.

Look for testers that are portable, easy to use, and provide clear diagnostics. A digital voltage readout is a plus for precise troubleshooting. Ensure the tester is compatible with your equipment, like trailers or vehicles, and is safe for modern electronic systems.
Electrical tools like testers quickly identify wiring issues, saving time and effort. They help determine if problems are with the tow vehicle or trailer, making them invaluable for regular maintenance and ensuring safe towing experiences.
Compatibility ensures the tool works effectively with your specific equipment, like different trailer types or vehicle wiring systems. This prevents misdiagnosis and ensures accurate troubleshooting, making your maintenance tasks more efficient.
These tools help identify wiring faults, preventing potential hazards like short circuits or electrical fires. By ensuring connections are secure and functioning, they enhance safety during repairs and everyday use, giving you peace of mind.
A good coupler should be easy to install, durable, and compatible with standard ball mounts. It simplifies trailer connections, especially when upgrading from older, rusted couplers, and ensures a secure fit for safe towing.
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