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GTC FF310 FaultFinder Short and Open Circuit Finder and Tracer

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  • Part Number: FF310


Open and Short Circuit Finder and Tracer

Tracing circuits is time consuming and thankless work. The FF310 FaultFinder helps you track down that open, short, or unidentified wire quickly and easily. With the FF310, you can get those circuits fixed, and the job done!

We’ve been making electronic troubleshooting tools for over 30 years, and this is our best one. The FF310 can track wires through interior panels, and anything else other than solid sheet metal, so you can find your problem quickly. Disassembling interior panels or bodywork and taking apart harnesses to manually inspect wires will always take more time and patience than you’ve got. The FF310 will get you to the fault straight away, so you know you’re not wasting time.

Who it’s For:

  • Heavy-duty mechanics
  • Commercial truck maintainers
  • Marine electricians
  • Automobile restorers

How it Works:

  1. Connect the FF310T (transmitter) in series with the circuit to be traced. Use (included) fuse socket connectors if necessary.
  2. Turn on both the FF310T and the FF310R (receiver).
  3. Use the receiver to trace the wire, the audible beeps and visible flashes should indicate your proximity to the wire. It is usually best to start near the transmitter.
  4. (Optional) manually adjust receiver sensitivity if you have any issue with tracing.


The FF310 FaultFinder is a specially designed tool for tracking and tracing short and open circuits, broken wires and current leaks on any electrical circuit with voltages from 6 to 42 Volt DC, and is used by technicians worldwide in an ample range of equipment such as automobiles, truck trailers, tractors, farming equipment, boats, forklifts, motorcycles, all-terrain and recreational vehicles, etc.

The 42V ready™ FF310’s wide working voltage range, automatic short/open detection, adjustable sensitivity levels and flexible antenna probe enables the technician to troubleshoot a complete array of common electrical problems without having to untie wire harnesses or remove body panels.

The FF310 Faultfinder is capable of:

  • Short circuit tracing
  • Open circuit tracing
  • Wire identification
  • Wire/Circuit tracing
  • Ground connections checks


  • Input Voltage: 6 to 42 volts DC.
  • Input DC Current: unlimited (internally limited)
  • Voltage Output: 5 volts DC maximum
  • Current Output: 100 mA DC RMS maximum
  • FF310T (Transmitter) Internal Battery: 1604A (9V), included with kit
  • FF310R (Receiver) Internal Battery: 1604A (9V), included with kit

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