Automotive Circuit Tester 6-24V DC Power Probe w/ Switch

Diagnose Your Car'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. Whether you're tracking down a short circuit, checking ground contacts, or testing voltage polarity, this powerful probe does it all — powered directly by your vehicle's battery, no extra batteries needed. Made in Mainland China.

Why You'll Love This Circuit Tester

• Multi-Function Diagnostics: Test voltage polarity, check continuity, activate components on or off the vehicle, test lights and connections, and locate short circuits — all with one tool.
• Wide Voltage Range (6–24V DC): Compatible with motorcycles, cars, trucks, RVs, and other DC-powered vehicles. Note: Do NOT use on AC voltage.
• Extra-Long 16ft (approx. 4m) Cable: Gives you the reach to test any part of the vehicle's electrical system without awkward stretching or repositioning.
• Built-in Illumination: Work confidently even in low-light or dark conditions — perfect for under-the-hood diagnostics at night or in dimly lit garages.
• Overload & Short-Circuit Protection: Automatically disconnects current when it exceeds 8A, protecting both you and your vehicle's electrical system.
• Simple Power Switch Operation: Rock the switch forward for positive current, backward for negative — intuitive and fast during real-world testing.
• Durable ABS + Metal Construction: Built to handle the rigors of a professional workshop or home garage.
• CE Certified: Meets European safety standards for electrical test equipment.

Key Specifications

• Operating Voltage: 6–24V DC
• Cable Length: 16ft (~4m)
• Overload Protection: Auto-disconnect at 8A
• 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 your vehicle's battery.
3. Clamp the black clip to the negative (–) terminal of your vehicle's battery.
4. Use the power switch to direct positive or negative current to the probe tip as needed.
5. Test circuits, activate components, and diagnose electrical issues with ease.

What's in the Box

• 1 × EM285 Automotive Electric Circuit Tester

Related Products You Might Like

• 10-Pack 22AWG Glass Tube Fuse Holder 5x20mm & 6x30mm Screw — great for wiring projects and circuit protection.
• 100-Pack Disposable Nitrile Gloves – Latex-Free, White, Oil-Proof — keep your hands protected while working on your vehicle.

For guidance on electrical safety when working with automotive systems, refer to the OSHA Electrical Safety Guidelines.

Frequently Asked Questions

Q: Can this automotive circuit tester be used on AC voltage systems?

A: No. The EM285 circuit tester is designed exclusively for DC voltage systems ranging from 6V to 24V. Using it on AC voltage can damage the unit and pose a safety hazard. It is intended for cars, motorcycles, trucks, and other DC-powered vehicles only.

Q: Does the circuit tester require batteries to operate?

A: No batteries are required. The circuit tester is powered directly by your vehicle's battery via the included red and black alligator clips, making it always ready to use without worrying about dead batteries.

Q: What happens if I accidentally create a short circuit while testing?

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

Q: Is this circuit tester suitable for professional mechanics as well as DIY users?

A: Absolutely. The intuitive power switch design, long 16ft test cable, and built-in illumination make it ideal for both professional automotive technicians and home DIYers who need a reliable, easy-to-use electrical diagnostic tool.