ANCEL Automotive Circuit Tester, 40-Foot Cord

The 40-foot cord gives the ANCEL PB100 room to reach along a vehicle while you trace wiring or check a component. That extra reach can make under-hood and trailer-light checks less awkward than working with a short probe lead.

It also goes beyond a basic test light: the probe can check circuits and apply battery power or ground to compatible components.

The trade-off is that this is a hands-on electrical diagnostic tool, not a complete vehicle diagnostic system. Its usefulness depends on having access to the circuit you need to test and using the powered functions appropriately.

Technical details

The PB100 is described for 6–30V automotive electrical systems. Its four modes are DC voltage, AC voltage, resistance, and diode testing, AC mode also supports minimum and maximum voltage and frequency measurements. A digital display shows readings, while red and green LEDs, audible feedback, and circuit monitoring help identify polarity, continuity, and open circuits without relying on the screen alone.

For fault-finding, it can help trace shorts, opens, and poor grounds. A built-in circuit breaker provides overload protection during appropriate powered tests, but that is not a reason to apply power without understanding the circuit. On the spec sheet, the broad mode selection makes this more versatile than a simple voltage-only probe, though no measurement accuracy or display specifications are provided here.

What it works with

The listed use is automotive electrical troubleshooting, including checks on cooling fans, blower motors, fuel pumps, headlights, window motors, and relays. It can also be used for trailer-light testing. The product description says it can apply battery power or ground to compatible components, which helps separate a faulty component from a wiring issue, compatibility should not be assumed for every vehicle part or circuit.

For example, if a headlight does not come on, you could check for voltage and polarity at its wiring, then use the probe’s powered function on a compatible component to help narrow down whether the problem is in the lamp or its supply. Compared with a basic test light, the PB100 offers more diagnostic modes and component activation. A more demanding diagnostic job may still call for tools or vehicle-specific information beyond the functions listed here.

Usage tips

Start with the circuit and mode that match the test: voltage for power checks, resistance or continuity for an unpowered circuit, and diode mode when checking a diode. Use the LEDs and audible feedback as quick cues, then read the display when you need the measurement. Keep powered component tests limited to compatible parts and appropriate test conditions, applying power to the wrong point can create a problem rather than clarify one.

The long cord is useful when moving between a battery area and wiring farther along the vehicle, including a trailer connection. It also means there is more lead to manage around the work area. It makes sense if you want one probe for polarity, circuit tracing, and selected component tests rather than only a quick voltage check. It might not be a great match if your main need is a basic pass/fail tester or if you need detailed vehicle-specific diagnostics not described here.

Before you decide

Does it test both AC and DC voltage? Yes. The listed modes include AC and DC voltage, AC mode also supports minimum and maximum voltage and frequency measurements.

Can it help find an open circuit or a bad ground? The product description lists open-circuit tracking and bad-ground detection, alongside continuity and polarity checks.

Can it activate electrical components? It can apply battery power or ground to compatible components, with examples including fans, pumps, headlights, window motors, and relays. That function is intended for suitable components, not indiscriminate testing.

Is it worth it?

The PB100 is worth considering if you regularly troubleshoot vehicle wiring and want more than a simple voltage indicator, especially with component activation and a 40-foot cord in the mix. Its range of checks can help narrow down common power, ground, and continuity faults without setting up separate jumper wires for every compatible component. If you only need occasional yes-or-no voltage checks, those extra modes may add complexity rather than value. The deciding point is whether you will use its broader circuit-testing functions, not just the probe itself.