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

Diagnose Your Vehicle's Electrical System Like a Pro

The Aermotor EM285 Automotive Electric Circuit Tester is the ultimate handheld diagnostic tool for mechanics and DIY car enthusiasts alike. With a wide 6–24V DC operating range, built-in power switch, and a generous 16ft (approximately 4m) cable, this circuit tester lets you quickly identify wiring faults, bad grounds, short circuits, and more — even in low-light conditions thanks to its built-in illumination function. Made in Mainland China.

Key Features

• Multi-Function Testing: Test voltage polarity, continuity, lamp circuits, electric motors, and DC voltage from 2V to 24V — all in one tool.
• Locate Short Circuits Fast: Follow and pinpoint short circuits and bad ground contacts instantly without guesswork.
• Overload Protection: Automatically disconnects current when it exceeds 8A, protecting both you and your vehicle's electronics.
• Long 16ft Cable: Reach any part of your vehicle with ease — no awkward positioning or extension leads needed.
• Built-In Illumination: Test electrical systems in dark engine bays or under-dash areas with confidence.
• Powered by Vehicle Battery: No separate batteries required — simply connect the red clip to the positive terminal and the black clip to the negative terminal.
• Easy Positive/Negative Output: Rock the power switch forward or backward to direct positive or negative current to the probe tip.
• CE Certified: Meets CE external testing certification standards.
• Durable ABS + Metal Construction: Built to handle the rigors of professional workshop and roadside use.

Specifications

• Brand: Aermotor
• Model: EM285
• Operating Voltage: 6–24V DC
• Cable Length: ~16ft (approx. 4m)
• Overload Protection: 8A auto-disconnect
• Material: ABS + Metal
• Color: Red
• Package Dimensions: 26.5 × 9 × 4 cm
• Package Weight: 320g (approx. 0.32 kg)
• 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 direct current forward or backward as needed.
5. Touch the probe tip to the circuit or component you wish to test.

What's in the Box

• 1 × EM285 Automotive Circuit Tester

For further guidance on automotive electrical safety and circuit testing best practices, visit the U.S. Consumer Product Safety Commission (CPSC).

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Frequently Asked Questions

Q: What vehicles is this automotive circuit tester compatible with?

A: The EM285 circuit tester works with any 6–24V DC vehicle electrical system, including cars, trucks, motorcycles, SUVs, and light commercial vehicles. It is not compatible with AC voltage systems.

Q: Does the automotive circuit tester require batteries?

A: No batteries are required. The circuit tester is powered directly by your vehicle's battery via the included red and black clamp leads.

Q: What happens if I accidentally short circuit something during testing?

A: The EM285 features built-in overload and short-circuit protection. If the current exceeds 8A, the unit automatically disconnects to protect both the tester and your vehicle's electrical system.

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

A: Yes! By rocking the power switch forward or backward, you can send positive or negative current through the probe tip to activate or deactivate vehicle components such as lights, motors, and solenoids — without needing to reconnect wiring.