Sierra 18-9904 Fault Finder Use the Sierra Fault Finder for tracking and tracing open and short circuits, broken wires and current leaks. Features Non-contact technology. No wire piercing required. Operates on 6 to 42 VDC systems 8 flexible probe for reaching wires in congested places Transmitter and receiver LEDs show open or short circuit conditions Adjustable sensitivity for all tracing situations Variable audiovisual signal provides fast intuitive feedback on the circuitwire proximity Traci