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ANCEL PB50 12V/24V Power Probe Automotive Circuit Tester Electrical Diagnostic
ANCEL AL-PB50 Automotive Power Circuit Probe Tester – Complete 12V/24V Diagnostic Tool for Electrical System Troubleshooting
The ANCEL AL-PB50 Power Circuit Probe Tester is a modern, multi-functional tool engineered for comprehensive automotive electrical system diagnostics. Designed for use on 12V and 24V DC systems, it simplifies the process of detecting faults, tracing circuits, activating components, and verifying system integrity. Whether you are a professional technician or a dedicated DIY enthusiast, the AL-PB50 provides a robust, intuitive, and highly capable testing solution for nearly all vehicle types.
Four Core Diagnostic Modes – One Versatile Tool
The AL-PB50 consolidates the functionality of multiple tools into a single handheld unit, featuring four essential test modes easily accessible via a single mode button:
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DC Voltage Test Mode – Measures and monitors direct current voltage accurately, critical for checking batteries, relays, and circuit voltage levels.
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AC Voltage Test Mode – Detects and displays alternating current voltage, enabling real-time waveform evaluation in components like sensors and alternators.
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Resistance Test Mode – Verifies resistance values within wiring and components, allowing users to quickly locate open circuits, damaged wires, or poor connections.
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Diode Test Mode – Tests diode function and directionality, ensuring that voltage flows correctly in components such as alternators and power modules.
These four core modes provide everything needed for initial diagnostics, ongoing testing, and post-repair verification.
Expanded Testing Capabilities for Comprehensive Diagnostics
The AL-PB50 extends beyond the basics to include numerous specialized functions:
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Short Circuit Finder – Helps locate hidden shorts quickly and accurately within complex wiring systems.
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Overload Protection – Built-in circuit breaker protects the tester and vehicle systems by cutting off power during overload conditions and automatically resetting.
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Polarity Testing – Instantly identifies positive and negative voltage, reducing the risk of incorrect connections or misdiagnoses.
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Continuity and Ground Testing – Confirms that wiring and connections are complete and properly grounded.
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Component Activation – Sends a direct power or ground signal to activate vehicle components both on- and off-vehicle (e.g., motors, fans, lights, wipers).
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Signal Circuit Testing – Allows testing of control signals from ECU to relays and actuators, helping isolate faults in electronic control systems.
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Self-Test Function – Ensures the tester is functioning properly before use, providing additional reliability and user confidence.
Activate and Verify Vehicle Components with Ease
With the AL-PB50, component activation is straightforward and safe. This feature allows users to power up specific components manually, helping to quickly verify their function without needing to operate the entire vehicle system. Users can:
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Trigger fuel pumps
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Activate radiator fans
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Power windshield wipers
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Operate lights, horns, window motors, and more
This is particularly useful when diagnosing systems that may be intermittently faulty or controlled by complex ECUs.
Built-in Circuit Protection for Safety and Durability
The AL-PB50 is equipped with an internal resettable circuit breaker that protects the tester and the vehicle’s electrical system from damage due to overload, shorts, or incorrect connections. If an issue is detected, the device will automatically shut down and restart once the condition is cleared, eliminating the risk of equipment or vehicle damage during use.
Real-Time Digital Feedback via High-Resolution Display
At the core of the AL-PB50’s interface is a 1.77-inch TFT color screen (160x128 DPI) which clearly displays all test values, waveforms, voltage polarity, resistance, frequency, and test results. This high-contrast display ensures easy visibility, even in poorly lit environments or under the hood.
Coupled with intuitive button placement and large, readable fonts, the interface allows for easy operation without requiring technical expertise. The built-in buzzer provides audible signals for continuity, polarity, and connection verification, further simplifying diagnostics.
Comfortable, Durable, and Designed for Real-World Use
The AL-PB50 is built with everyday use in mind. Its ergonomic grip ensures comfort during long diagnostic sessions, while the integrated flashlight on the probe tip illuminates hard-to-see areas, allowing for precise probing in dark or cramped engine compartments.
The 13-foot (4-meter) long cable ensures flexibility for testing across large vehicles such as trailers, pickup trucks, and commercial rigs. For even larger applications, users can connect the tester directly to an external 12V or 24V power source to maintain consistent functionality.
The probe itself features a secure push-fit design to ensure a firm connection during use. A "click" confirms when the probe is correctly seated, preventing disconnection or performance issues mid-test.
Technical Specifications
Function | Specification |
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Power Supply | 12V DC or 24V DC |
Display | 1.77” TFT Color (160x128 DPI) |
DC Voltage Detection | 0–60V |
AC Waveform Display | Supported (0–10kHz) |
Resistance Range | 0–100KΩ |
Diode Detection | Yes |
Frequency Testing | 0–10kHz with waveform |
Voltage Polarity Light | Yes |
Buzzer | Yes |
Max/Min Value Detection | Yes |
Component Activation | Yes |
Circuit Breaker Protection | Yes |
Compatible with Most Vehicle Types
The AL-PB50 supports a wide range of 12V and 24V vehicles, including:
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Sedans and SUVs
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Pickup trucks and trailers
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Commercial vehicles and big rigs
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Motorcycles and recreational vehicles
This broad compatibility makes the tester an excellent addition to any automotive repair toolkit, whether for personal use or in a professional workshop setting.
ANCEL PB50 12/24V Car Electric Circuit Tester Probe Pen Tester Voltage Resistant Test Voltage Power Probe Kit Car Battery Tester
With the PB50 probe tester, you can check voltage and ground signals in a typical DC circuit. However, the kicker is that you can also use it to send voltage and ground signals. It works like a test light that can power circuits or provide a good known ground. This way, you can effectively test components and circuits without having to break out the old alligator clips and jumper wires. You can power or ground a circuit directly through the top of the device.

ANCEL PB50 Product Function:
There are four modes to diagnose the electrical systems, which can be accessed by depressing the Mode Button and cycling through each one.
✔️DC voltage
While the tool in this mode, contact the probe tip to a circuit, then the LCD display will read the DC voltage with a resolution of 0.1 volt.
✔️AC voltage
While the tool in this mode, contact the probe tip to a circuit, then the LCD display will read the Max. voltage, the Min. Voltage and frequency.
✔️Resistance
While the tool in this mode, contact the probe tip to a circuit, then the LCD display will read the resistance between the tip and auxiliary ground lead.
✔️Diode
In this mode, the probe tip contact the positive terminal of the diode, connect the auxiliary ground lead to the negative terminal of the diode, the screen will display the forward voltage drop, indicates the forward bias. If exchange the probe tip and auxiliary ground lead, the screen will not display the voltage, indicates the reversebias.



ANCEL PB50 Electrical System Circuit Tester Functions:
1. Power injection, measuring, ground testing, polarity checking, continuity testing and component activation.
2. Read the AVO meter, voltage, current, and resistance.
3.Energize the electrical components, such as the cooling fan, relay etc.
4. Activate the components
5. Determine the positive, negative and open circuit.
6. Test the bad ground contacts, follow and locate short circuits without wasting the fuse.
7. Test the continuity of the power switch, relay and diode.
8. Protect the tool from overload.
9. Allow you to work in the dark area by using the built-in head light.
10. Test along the vehicle by the long cable.
Quick diagnosis, save time and money!
This PB50 is the savior of your old car wiring problems, making your repair work easy and fast!


4 IN 1 Multi-Function, Double Efficiency!
Whether it is tracing circuits or identifying damaged parts, our probe is the ideal choice for DIY enthusiasts, electricians and technicians.





Activate Components
It sends an activation signal to check if components are okay. You can activate all sorts of components on hand/vehicle/ground, like turning on car lights, getting motors spinning, making windshield wipers swipe, and radiator fans whirl – you name it!
Innovative Design, Easy Operation!


The new ANCEL PB50 probe circuit tester adds multiple test functions to the traditional probe, and has built-in short-circuit protection, which can provide you with a safer diagnostic environment! In addition, this probe can also support most 12V & 24V vehicle electrical tests



Comfort & Convenience Design
The ANCEL PB50 has a design that's out of this world! It's ergonomic, so it feels great in your hand. The interface has been spruced up with larger and more intuitive fonts, making it a breeze to read. Built-in flashlight on its top – it's like a little sunbeam that lights up the surrounding environment, providing the best view in darkness.


