Circuit Tester with Light — quick, reliable electrical troubleshooting for automotive systems Key benefits Saves diagnostic time: bright indicators and a long 4 m cable let you reach wiring and components without moving the vehicle or stretching leads. One-handed convenience: large alligator clip for secure, single-hand grounding or power connection so you can probe and hold components easily. Safer testing and simple checks: instantly confirms presence of power and lets you safely energize fans, motors and other circuits for functional tests. What it does (functions) Tests continuity and identifies open circuits. Detects polarity: probe on positive (+) lights red; probe on negative (‑) lights green. Finds bad ground contacts and locates short circuits. Checks operation of switches, relays, diodes (on/off), fuses and general circuits. Practical features 4 m cable for extended reach in engine bays and vehicle underbody areas. Large alligator clip for secure, stable connection and easier one-hand operation. Clear red/green light indication for fast polarity identification and decision-making. Performance and compatibility Designed specifically for automotive electrical systems and everyday workshop troubleshooting. Practical for mechanics, technicians and DIY vehicle owners who need a straightforward, fast diagnostic tool. Typical use scenarios Replace a blown fuse: clamp the alligator clip to a known good ground, probe both sides of the fuse to confirm continuity and polarity before replacing. Diagnose a non‑starting fan or motor: safely power the device using the tester to verify if the component runs, then use the probe to trace faults in wiring or grounds. Track a short or bad ground in a wiring harness: use the probe along harness sections while watching the indicator lights to locate where polarity changes or continuity is lost. Why choose this tester Straightforward indicators and a long cable reduce time spent moving and reconfiguring test leads. Large clip and simple probe operation make common checks faster and more reliable. Covers a wide range of everyday automotive electrical checks without complicated setup.