Ancel PB50 / PB100 Power Scan Circuit Tester Probe
Updated June 17, 2026
The Ancel PB50 and PB100 are handheld circuit tester probes designed for diagnosing 12V and 24V automotive electrical systems. They function as a power probe, allowing technicians to test circuits for voltage, continuity, polarity, and to activate components directly. These tools replace traditional test lights and multimeters for many common electrical troubleshooting tasks.
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How It Works
The probe connects to the vehicle battery via alligator clips. A rocker switch on the handle lets the user apply positive or negative voltage to the probe tip, effectively turning it into a powered test light. The PB100 adds additional functions such as circuit breaker/open testing, wire tracing, diode and resistance testing, and relay/fuse testing. Both models provide audible and visual feedback for continuity and voltage presence.
Common Failure Symptoms
Electrical issues such as dead shorts, open circuits, blown fuses, faulty relays, and poor grounds can be quickly identified. The probe can test trailer light circuits, signal circuits, and activate components like fuel pumps or cooling fans to verify operation. It is especially useful for diagnosing intermittent electrical problems.
Installation Notes
No permanent installation is required. The user connects the red clamp to battery positive and black clamp to battery negative or a known good ground. The probe is then ready to use. Ensure the vehicle battery is in good condition and the clamps have clean connections. The tool is designed for 12V and 24V systems only.
