Automotive Electric Circuit Tester 6-24V DC | Power Probe

Diagnose Your Vehicle's Electrical System Like a Pro

The Aermotor EM285 Automotive Electric Circuit Tester is a must-have tool for mechanics and DIY car enthusiasts alike. With a working range of 6–24V DC, a 16ft cable, and built-in overload protection, this power probe makes diagnosing car electrical problems fast, safe, and accurate — even in the dark.

Made in Mainland China.

Why You'll Love This Circuit Tester

• Multi-Function Testing: Test voltage and polarity, check lamps and electric motors, perform continuity tests, locate short circuits, and check for bad ground contacts — all with one tool.
• Wide 6–24V DC Range: Compatible with motorcycles, cars, trucks, and other 6V or 12V/24V DC vehicle systems. Do not use on AC voltage.
• 16ft (4.8m) Long Test Lead: Reach any part of your vehicle's electrical system without having to reposition the tester repeatedly.
• Built-In Overload Protection: Automatically disconnects current when it exceeds 8A, protecting both the tool and your vehicle from damage.
• Illumination Function: The built-in light lets you work confidently in dark engine bays or under-dash environments.
• Power Switch Control: Rock the ergonomic switch forward or backward to send positive or negative current to the probe tip — simple and intuitive.
• Vehicle-Powered: No batteries needed — the unit draws power directly from the vehicle's battery via the included red and black alligator clips.
• Durable ABS + Metal Construction: Lightweight at just 320g, yet built tough for repeated workshop use. CE certified.

Specifications

• Operation Voltage: 6–24V DC
• Cable Length: 16ft (~4.8m)
• Overload Protection: 8A auto-disconnect
• Material: ABS + Metal
• Color: Red
• Package Size: 26.5 × 9 × 4 cm
• Package Weight: 320g
• Certification: CE

How to Use

1. Unroll the unit's cable fully.
2. Clamp the red clip to the positive (+) terminal of the vehicle's battery.
3. Clamp the black clip to the negative (−) terminal of the vehicle's battery.
4. Use the power switch to select positive or negative output at the probe tip.
5. Touch the probe to the circuit or component you wish to test.

What's in the Box

• 1 × EM285 Automotive Circuit Tester

Related Tools You May Need

Looking for more workshop essentials? Check out our 100-Pack Disposable Nitrile Gloves – Latex-Free, Oil-Proof for hand protection while working on your vehicle, or the 120ml Heavy-Duty Metal Rust Remover & Anti-Rust Spray to keep your car's metal components in top condition.

For more guidance on automotive electrical safety, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety standards and best practices when working with electrical test equipment.

Learn more: In-circuit testing

Frequently Asked Questions

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

A: The Aermotor EM285 circuit tester works with DC voltages from 6V to 24V, making it suitable for motorcycles, passenger cars, light trucks, and other 6V or 12V/24V DC vehicle electrical systems. It is not designed for AC voltage use.

Q: Does the circuit tester require batteries?

A: No batteries are required. The tester is powered directly by the vehicle's own battery. Simply attach the red alligator clip to the positive terminal and the black clip to the negative terminal to power the unit.

Q: What happens if the current exceeds 8A during testing?

A: The built-in overload protection feature automatically disconnects the current when it exceeds 8A, safeguarding the tester and your vehicle's electrical components from potential damage.

Q: Can I use this circuit tester to activate vehicle components?

A: Yes! By rocking the power switch forward or backward, you can deliver positive or negative current to the probe tip, allowing you to activate or test components such as lights, motors, relays, and solenoids either on or off the vehicle.