Aermotor Automotive Circuit Tester 6-48V LED Voltage Probe Kit

Diagnose your vehicle's electrical system with confidence using the Aermotor Automotive Electric Circuit Tester. This professional-grade probe kit features a clear digital voltage display, built-in buzzer, and color-coded LED indicators — giving you fast, accurate readings for any 6V to 48V DC automotive circuit. Whether you're chasing a short circuit, checking continuity, or testing ground connections, this tool has you covered from bumper to bumper.

Made in Mainland China.

Why Choose the Aermotor Circuit Tester?

• Accurate Digital Voltage Display: Instantly read DC voltages from 6V to 48V — far more precise than traditional test lights or analogue testers. Perfect for modern cars, trucks, RVs, and electric vehicles.
• Overload Protection (8A Auto Cut-Off): When current exceeds 8A, the tester automatically cuts off the circuit, protecting both you and your vehicle from potential damage.
• Built-In Buzzer & Dual-Color LED: Red LED = positive voltage. Green LED = negative voltage. The audible buzzer alerts you to circuit conditions even when you can't see the display — ideal for tight, dark engine bays.
• Extra-Long 4.5-Meter Cable: Reach from the front to the rear of any vehicle without repositioning your ground clamp. No more stretching or guessing — test any circuit in one go.
• Multi-Function Testing: Handles voltage measurement, polarity detection, continuity testing, short circuit tracing, ground integrity testing, component testing (online & offline), and jumper operations.
• Wide Compatibility: Two voltage ranges available — 6–36V and 6–48V — covering 12V/24V passenger vehicles, trucks, marine systems, and hybrid/EV auxiliary circuits.

How to Use

1. Connect the red clip to the battery positive terminal and the black clip to the negative terminal. The blue digital display shows the current battery voltage.
2. Press the tester button to the (▲) position for positive output (LED red) or the (▼) position for negative output (LED green) to self-check.
3. Touch the probe to any circuit contact point: Red LED = positive voltage present; Green LED = negative/ground present.
4. For continuity tests, clamp the black clip to one end of the wire and probe the other — green LED confirms a live connection.
5. For grounding tests, press to the negative position and touch the probe to the component's ground point — green LED + buzzer = good ground.

Specifications

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For more information on automotive electrical safety, visit the U.S. Consumer Product Safety Commission (CPSC) for guidance on safe use of electrical testing equipment.

Frequently Asked Questions

Q: What voltage range does the Aermotor automotive circuit tester support?

A: The Aermotor circuit tester is available in two versions: a 6–36V DC model and a 6–48V DC model. Both are suitable for standard 12V and 24V automotive systems, with the 6–48V version also covering larger trucks, RVs, marine vessels, and some hybrid vehicle auxiliary circuits.

Q: Does the circuit tester have overload protection?

A: Yes. The Aermotor automotive probe tester features an automatic cut-off function that activates when current exceeds 8 amps, protecting both the user and the vehicle's electrical system from damage during testing.

Q: Can I use this circuit tester in dark or poorly lit spaces?

A: Absolutely. The tester includes a built-in dual-color LED light (red for positive voltage, green for negative/ground) and an audible buzzer, so you can get clear readings by sight or sound even in tight, dark engine bays or under-dash environments.

Q: How long is the cable on the Aermotor circuit tester?

A: The tester comes with an extended 4.5-meter (approximately 15-foot) cable, allowing you to ground the clamp at the battery and comfortably probe circuits anywhere in the vehicle — front to rear — without moving your ground connection.

Q: Is this circuit probe suitable for testing modern electric or hybrid vehicles?

A: The 6–48V model can handle the auxiliary 12V/24V circuits found in hybrid and electric vehicles. However, it is not designed for high-voltage EV drive systems (typically 300V+). Always follow your vehicle manufacturer's safety guidelines when working with any electrical system.