Automotive Circuit Tester 6–24V | LED & Buzzer Voltage Tester

Automotive Circuit Tester – Fast, Accurate, Reliable

Take the guesswork out of electrical diagnostics with this Automotive Circuit Tester. Covering a wide 6V to 24V voltage range, it's the go-to tool for mechanics and DIY enthusiasts who need to quickly pinpoint faults in car wiring, fuses, relays, sensors, and more. The bright LED display gives you instant visual confirmation, while the built-in buzzer notification provides an audible alert — so you never miss a live circuit, even when you're working in tight or dimly lit spaces.

Made in Mainland China.

Key Features

• Wide Voltage Range: Tests 6V, 12V, and 24V circuits — compatible with cars, trucks, motorcycles, RVs, and marine electrical systems.
• Dual Notification: LED indicator light + audible buzzer work together for quick, unmistakable readings.
• Multifunctional Design: Detects live wires, checks fuses, tests relays, and verifies ground connections all in one handy tool.
• Durable Build: Rugged green housing designed to withstand the rigors of a busy workshop or roadside environment.
• No Battery Required: Powers directly from the vehicle's electrical system — always ready when you need it.
• Easy to Use: Simply connect the ground clip and probe the test point — the LED and buzzer immediately confirm circuit status.
• Compact & Portable: Lightweight enough to keep in your glove box, tool bag, or workshop drawer.

What Can You Test?

• Automotive fuses and fuse boxes
• Wiring harnesses and connectors
• Relays and solenoids
• Ignition circuits and sensors
• Battery and charging system voltage presence
• Trailer wiring and lighting circuits

Specifications

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Safety & Standards Reference

For best practices when working with automotive electrical systems, refer to guidelines from the U.S. Occupational Safety and Health Administration (OSHA) – Electrical Safety.

Frequently Asked Questions

Q: What voltage range does this automotive circuit tester support?

A: This circuit tester supports a wide range of 6V to 24V DC, making it compatible with standard passenger cars (12V), trucks and heavy-duty vehicles (24V), motorcycles, RVs, and even marine applications.

Q: Does the automotive circuit tester require a battery to operate?

A: No — this tester draws power directly from the vehicle's own electrical system through the test probes, so no separate battery is needed. It's always ready to use straight out of the box.

Q: How do the LED display and buzzer notification work together?

A: When the probe makes contact with a live circuit, the LED lights up for a clear visual signal and the buzzer sounds an audible alert simultaneously. This dual-notification system lets you confirm circuit status even in noisy workshops or areas where visibility is limited.

Q: Can I use this circuit tester on motorcycles or trucks, not just cars?

A: Absolutely. Because it covers 6V to 24V, it works on motorcycles (6V/12V), standard cars (12V), and larger commercial trucks or diesel vehicles (24V), as well as trailers, boats, and RVs.