Automotive Circuit Tester

Test voltage, polarity, continuity, relays, wiring, and electrical components with one powerful handheld tool. Designed for cars, trucks, motorcycles, boats, and other 6V-30V vehicles.

Powerful Features for Faster Diagnosis

Real-Time Voltage Detection

See Circuit Status at a Glance

The digital display shows the detected voltage in real time, helping you quickly determine whether a circuit is powered correctly. Red and green indicator lights make positive and negative/ground detection easier to recognize.

Built-In 4-Pin & 5-Pin Relay Tester

Test Relays Without Jumper Wires

Test standard automotive relays directly with the built-in relay testing function. Quickly check coil operation, contact switching, and abnormal engagement to help identify faulty relays before replacing otherwise good parts.

Supports common 4-pin and 5-pin automotive relays.

Positive & Negative Power Output

Activate Components to Verify Operation

Don't just measure a circuit - test whether the component actually works. With one-click positive and negative output, you can directly activate compatible components and quickly determine whether the problem comes from the component itself or its wiring.

Ideal for testing motors, fans, lights, relays, pumps, solenoids, and more.

Complete Circuit Troubleshooting

Find Electrical Faults Faster

Designed for more than simple voltage checks. Use the probe to inspect continuity, polarity, short circuits, open circuits, poor grounds, leakage, and other common electrical problems.

Spend less time tracing wires and more time fixing the actual fault.

6V-30V Wide Compatibility

One Tester for Cars, Trucks & More

From everyday vehicles to heavy-duty equipment, the wide 6V-30V operating range makes this tester suitable for a variety of electrical systems.

Cars - SUVs - Vans - Trucks - Buses - Motorcycles - Boats - Tractors - Riding Mowers - Engineering Machinery

Whether you're working on a 12V passenger car or a 24V commercial vehicle, one tool covers your everyday diagnostic needs.

Extended Reach for Hard-to-Access Areas

More Freedom Around the Vehicle

The long coiled extension cable lets you move around the vehicle while keeping the tester connected to the battery. Easily reach engine compartments, dashboards, rear wiring, lighting circuits, and other difficult areas without constantly repositioning the tool.

More reach means less hassle during every inspection.

Built for Everyday Workshop Use

Durable, Portable & Ready to Work

A shock-resistant and moisture-resistant housing helps the tester handle demanding garage and roadside conditions. The compact handheld design is easy to carry, while the operating range of -20C to +55C supports reliable use across changing environments.

Professional enough for mechanics. Convenient enough for DIY users.

Test More. Guess Less.

Why Choose an All-in-One Circuit Tester?

Product Specifications

What's Included

• 1 x Automotive Circuit Tester
• 1 x Long Extension Cable
• 1 x Battery Alligator Clip Set
• 1 x User Manual

Customer Reviews

5 Stars

A huge time saver in the garage.

I use it for checking wiring, fuses, and relays. The power output function makes component testing much faster than using separate jumper wires.

- Michael R.

5 Stars

Simple but very capable.

The display is easy to read, and the polarity indicators make troubleshooting much easier. Great tool for everyday electrical repairs.

- James T.

5 Stars

Works great on my truck.

I needed something that could handle both 12V and 24V systems. The long cable is also really useful when working around larger vehicles.

- David K.

Frequently Asked Questions

Diagnose Faster. Repair Smarter.

One Tool for Everyday Vehicle Electrical Troubleshooting

From a simple voltage check to relay diagnosis and component activation, the Automotive Circuit Tester gives you the functions you need to locate electrical problems faster and work with greater confidence.

Less Guessing. More Testing. Faster Repairs.