3-in-1 Automotive Power Circuit Probe & Relay Tester – 12V/24V Electrical Diagnostic Tool
3-in-1 Automotive Power Circuit Probe & Relay Tester – 12V/24V Electrical Diagnostic Tool
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3-in-1 Automotive Power Circuit Probe & Relay Tester – 12V/24V Electrical Diagnostic Tool
3-in-1 Automotive Diagnostic System
Stop Guessing.
Find Electrical Faults Faster.
Test circuits, identify polarity, activate compatible components and diagnose common automotive relays with one powerful tool.
Too Many Tools. Too Much Time.
Stop Switching Between Multiple Testers
Traditional electrical diagnosis often means tangled leads, repeated setup and constant switching between meters, probes and relay tools.
Spend less time setting up tools and more time identifying the actual fault.
See the Circuit Clearly
Get Voltage and Polarity Answers in Seconds
The backlit LCD displays real-time DC voltage while the red and green indicators help identify power and ground without repeated range changes.
- Real-time DC voltage display
- Red indication for positive or power
- Green indication for negative or ground
- Faster checks across complex vehicle wiring
Test Before You Replace
Find Out Whether the Part Is Actually Bad
Apply positive or negative battery power through the probe to test compatible lights, motors, fans and other DC components.
- Separate wiring problems from component failures
- Avoid replacing parts that still work
- Verify compatible components directly
- Reduce unnecessary repair costs and wasted time
Dedicated Relay Diagnostics
Test Common Automotive Relays With Confidence
Use the integrated relay testing area to check selected common 4-pin and 5-pin automotive relays before installing replacements.
- Check relay coil operation
- Identify abnormal engagement
- Detect faulty or sticking contacts
- Reduce trial-and-error part swapping
Built for Real Repair Conditions
See the Connection—Even in Dark, Tight Spaces
Dual LEDs near the probe tip illuminate wires, connectors and terminals under dashboards, inside engine bays and around hard-to-see components.
- Focused light directly around the test point
- Better visibility around hidden terminals
- Ideal for engine bays and under-dash repairs
- Less dependence on a separate flashlight
Wide Vehicle Compatibility
One Diagnostic Tool for 12V and 24V Systems
Designed for compatible DC electrical systems across personal, recreational and commercial vehicles.
Simple Diagnostic Workflow
Connect. Probe. Diagnose.
Attach the red and black clamps to a compatible 12V or 24V DC vehicle battery.
Probe the wire, terminal, fuse, connector or compatible component you need to test.
Use the LCD, polarity indicators, continuity response and test controls to locate the issue.
Product Highlights
Fewer Tools. Faster Answers. Better Repairs.
- Combines circuit testing, component activation and relay diagnostics
- Real-time DC voltage readings on a backlit LCD
- Automatic positive and negative polarity indication
- Continuity and circuit condition testing
- Positive and negative component activation controls
- Testing for selected common 4-pin and 5-pin relays
- Dual LED illumination around the probe tip
- Built-in overload protection
- Long cable for extended access around the vehicle
- Compatible with supported 12V and 24V DC systems
Technical Information
Specifications
| Product Type | Automotive Power Circuit Probe & Relay Tester |
| Diagnostic Functions | Voltage Test • Polarity Detection • Continuity Test • Component Activation • Relay Test |
| Voltage Range | DC 3.5–36V |
| System Compatibility | Compatible 12V and 24V DC vehicle systems |
| Rated Current | 1–8A |
| Overload Protection | Integrated protection up to approximately 8A |
| Relay Compatibility | Selected common 4-pin and 5-pin 12V/24V automotive relays |
| Display | Backlit digital LCD with polarity indicators |
| Work Light | Dual LED probe illumination |
| Operating Temperature | Approximately -10°C to 60°C |
| Relative Humidity | ≤80% |
| Power Source | Connected vehicle battery |
| Package Includes |
1 × Circuit & Relay Tester 1 × Long Power Cable 1 × Red Battery Clamp 1 × Black Battery Clamp 1 × Probe Tip 1 × User Manual |
| Great For | Mechanics • Automotive Electricians • Repair Shops • Mobile Technicians • Fleet Maintenance • DIY Vehicle Owners |
Frequently Asked Questions
What You Need to Know
Does it work with both 12V and 24V vehicles?
Yes. It is designed for compatible 12V and 24V DC vehicle electrical systems.
Can it test automotive relays?
It includes an integrated testing area for selected common 4-pin and 5-pin automotive relays. Always verify the relay layout before testing.
Can it power a fan, light or motor?
It can apply positive or negative battery current to compatible DC components for diagnostic purposes. Confirm the component rating first.
Does it replace a professional multimeter?
It replaces several common automotive diagnostic tools, but it is not intended to replace every function of a full multimeter, oscilloscope or manufacturer-specific scan tool.
Can it be used on household outlets?
No. This tester is intended for compatible automotive DC circuits only. Never use it on AC household wiring.
Who is this tool best suited for?
It is useful for mechanics, automotive electricians, repair shops, mobile technicians, fleet maintenance teams and experienced DIY users.
One Tool. Complete Control.
Save Time, Find Faults Faster and Repair With Confidence
Upgrade your toolbox with an all-in-one diagnostic system built to make automotive electrical troubleshooting faster, cleaner and more controlled.
Stop Guessing. Start Diagnosing.
Find the Fault Before You Replace the Part
Carry fewer tools, get clearer answers and take control of your next automotive electrical repair.
