3–48V Low-Voltage DC Circuit Tester and Digital Circuit Breaker Finder Why you need it Saves diagnostic time: quickly isolate open circuits, shorts, and poor connections without disassembling wiring harnesses. Covers the most common vehicle and small-engine electrical systems with a single tool, eliminating the need for multiple testers. Gives clear, actionable results so you can make repairs sooner and avoid repeated troubleshooting. What it does (functions) Dual-purpose tool: functions as a low-voltage DC circuit tester and a digital circuit breaker finder. Tests 3–48V DC circuits to verify power, ground, and continuity. Designed to check vehicle circuits and small-engine ignition/spark circuits, including headlights, taillights, sockets, and fuse connections. Compatibility and performance Wide 3–48V operating range: compatible with most automotive, motorcycle, marine, ATV, scooter, and small engine electrical systems that use low-voltage DC. Digital detection improves fault identification versus basic continuity probes, making it easier to pinpoint problematic sections of a circuit. Suitable for testing a variety of 3–48V lines and components without changing tools. Practical applications (real-world scenarios) Headlight troubleshooting: quickly determine whether a headlight failure is caused by a bulb, socket, fuse, or wiring fault and find where power is lost. Trailer or taillight wiring: trace a break or bad ground in multi-wire trailer harnesses to restore turn and brake light function. Small engine spark and socket checks: verify power to ignition coils, spark circuits, or accessory sockets on lawn mowers, generators, and other 3–48V small engines. What you get from using this tester Faster, more accurate diagnosis of low-voltage DC electrical problems. One tool for multiple jobs—streamlines on-vehicle testing and reduces trips to the parts store. A practical solution for mechanics, DIYers, fleet technicians, and landscapers working with 3–48V systems. Note: Designed specifically for low-voltage DC systems in the 3–48V range for vehicle and small-engine circuit testing, including headlights, taillights, faulty sockets, fuse connections, and other 3–48V lines and circuits.