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FF310 Short Open Circuit Tester

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Short Circuit Finder
Electrical Faultfinder:


FF310 FaultFinder: Open and short circuit finder and tracer


FF310 Brief Description

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.


FF310 Features

  • 42 V Ready: for use in the new generation of vehicles with mixed or single 42 Volt systems

  • Operates on DC voltages from 6 to 42 volts.

  • Internally protected against power surges and overloads.

  • 8" flexible probe allows reaching wires in congested places.

  • Transmitter and Receiver LEDs show open or short circuit conditions.

  • Variable audio/visual signal provides fast and intuitive feedback on the circuit/wire proximity.

  • Adjustable sensitivity for all tracing situations.

  • No wire piercing required, non-contact technology!

  • Tracing of wires is made possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc.

  • Transmitter has auto polarity and leads with 5 amps   alligator  clips

Easy and flexible to use


It only requires connecting the transmitter in series with the circuit or wire under test, (i.e.: in place of a blown fuse, across a connector, in series with an open wire, a light bulb socket, etc.), and scanning the circuit/wire with the tracer’s flexible probe to find the trouble spot.


This professional tool will work on all kinds of circuits with voltages between 6 and 42 Volt DC, such as those found in automobiles, trucks, trailers, tractors, boats, RVs, etc… With its wide working voltage range, automatic open/short detection, flexible probe and adjustable sensitivity, the FF310 Faultfinder enables you, to troubleshoot a complete array of common problems, in a wide variety of vehicles.


Now with the FF310 you can locate short circuits, broken wires, current leaks and perform wire tracing quickly and easily spending only a fraction of the time and effort required when using conventional methods. In most cases, you will even be able to locate the problem area without having to untie harnesses, open conduits or remove panels.


Technical Specifications


FF310T (Transmitter)

Indicators: Green LED for power On and Open circuits. Red LED for short circuits.

Power source: 9-volt alkaline battery. Duracell type MN1604 (included)

Battery life: approx. 25 hrs.

Connector: Two 5 A alligator clamps with auto polarity and 18” long cable.

Physical dimensions: 6” (H) x 1.75” (W) x 0.875” (D) - (152.5 x 44.5 x 23 mm) - Excluding probes

Weight: Approximately 5.2 Oz ( 145 g) Including battery

FF310R (Receiver)

Sensitivity: Three user selectable sensitivity levels (low, medium and high).

Receiver probe: Flexible 8” gooseneck insulated steel probe.

Indicators: Green LED indicator for power on and open circuits. Red LED indicator for short circuits.

Variable flashing and modulated audible signal.

Power source: Standard 9-volt alkaline battery. Duracell type MN1604 (included)

Battery Life: approx. 25 hrs. Auto Power Off.

Physical dimensions: 6.125” (H) x 1.75” (W) x 0.875” (D) - (155 x 44.5 x 23 mm) - Excluding probe

Weight: Approximately 5.2 Oz ( 145 g) Including battery




Short circuit tracing

Open circuit tracing

Wire identification

Wire/Circuit tracing

Ground connections checks


For use in:







Any 6 to 42 Volt DC powered circuits.


FF310 Includes:


FF310T ( transmitter)

FF310R (receiver)

CT6100 Fuse block adapters (three sizes: Mini, ATO and Maxi)

CT8002 Computer safe cordless circuit tester

Hard padded case for carrying and storage .

User’s Manual




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