Skip to content
Menu

GTC

GTC FF310

GTC FF310 FaultFinder kit with the FF310T transmitter, FF310R receiver and accessories, maker's studio photo on white

1 / 2 · Product viewGTCOriginal

Check your model and package

FF310 complete kit (transmitter, receiver, CT8002 tester, GTC062 fuse socket set)

Working voltage range:
6 to 42 volts DC (DC only; GTC warns never to connect it to AC or to circuits over 42 V DC)
What it traces:
Short circuits, open circuits, broken wires, current leaks, and wire identification/tracing without untying harnesses (maker's description)
Transmitter (FF310T) output:
Current-limited pulsing 5-volt signal for open circuits; pulses the power already in the circuit for shorts, with current-limiting protection (product page FAQ)

We may earn a commission. How we earn.

Find on Amazon
Compare
Package details

Model: FF310

The full kit as sold by GTC: transmitter, receiver, CT8002 circuit tester and GTC062 fuse socket connector set in a padded case.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing

Important limit: DC only: GTC states it must never be used on AC voltage or circuits connected to AC lines

Confirm condition, quantity and included accessories on the retailer’s listing.

Compare versions and packages

Specifications checked November 5, 2026. Full product details

GTC FF310 FaultFinder Open and Short Circuit Finder and Tracer

A two-part circuit tracer for 6–42 V DC vehicle and equipment wiring: a transmitter injects a coded signal into the circuit and a battery-powered receiver with a flexible probe locates opens, shorts and hidden wires through panels.

Which version should you buy?

Selected package: FF310 complete kit (transmitter, receiver, CT8002 tester, GTC062 fuse socket set).

Bundles and accessories

  • FF310 complete kitModel: FF310

    Contents and availability

    The full kit as sold by GTC: transmitter, receiver, CT8002 circuit tester and GTC062 fuse socket connector set in a padded case.

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • The older FF300 FaultFinder looks similar but is not 42V-ready and has no encoded signal; check the model number on the case.
  • The FF310T transmitter and FF310R receiver are not sold separately as a working tracer; listings selling only one unit cannot trace circuits.

Why people pick it

  • Traces wires through interior panels and anything other than solid sheet metal, so you can find faults without disassembling trim or untying harnesses
  • Wide 6–42 V DC working range covers 12 V and 24 V vehicle systems, and the internal fuse protects the tool if it is connected above 42 V DC
  • Both open-circuit and short-circuit modes in one kit, plus wire identification and current-leak tracing
  • Kit includes fuse socket connectors in four sizes and the CT8002 circuit tester, so you can hook up at the fuse box without piercing wires
  • Encoded signal for noise rejection, and three receiver sensitivity levels for difficult bundles (maker's description and manual)

Know before you buy

  • DC only: GTC states it must never be used on AC voltage or circuits connected to AC lines
  • Not for ignition-system components, and GTC cautions disconnecting air bags and sensitive modules before use
  • Tracing is impeded by wires running close to metal frames or return conductors, which weaken the magnetic field signal (manual)
  • No digital readout of distance or fault position: it locates the fault area by audio/visual signal only
  • Transmitter and receiver each need a 9 V battery, with about 25 hours of life each (manual)

Full specifications

Working voltage range6 to 42 volts DC (DC only; GTC warns never to connect it to AC or to circuits over 42 V DC)
What it tracesShort circuits, open circuits, broken wires, current leaks, and wire identification/tracing without untying harnesses (maker's description)
Transmitter (FF310T) outputCurrent-limited pulsing 5-volt signal for open circuits; pulses the power already in the circuit for shorts, with current-limiting protection (product page FAQ)
Transmitter indicatorsFlashing green LED for power on or open circuit; flashing red LED for short circuit
Transmitter connectorTwo 5 A universal micro-clips with auto polarity, 18 in (45 cm) cable
Receiver (FF310R) probeFlexible 8 in (20 cm) gooseneck insulated steel probe with built-in sensor
Receiver sensitivityThree user-selectable levels: Low, Medium, High
Receiver indicatorsGreen LED for power on and open circuits; red LED for short circuits; variable flashing and modulated audible signal
Receiver auto-offTurns itself off after 3 minutes of not being used, to conserve battery (manual)
BatteriesTwo 9 V alkaline batteries (NEDA MN1604 / IEC 6LR61), included; about 25 hours of use each (manual)
Over-voltage protectionInternal surge arrestor that blows an internal fuse if connected above 42 V DC (product page FAQ)
Kit contentsFF310T transmitter, FF310R receiver, CT8002 computer-safe cordless circuit tester, GTC062 fuse socket connector set (ATC/ATO, Mini, Low Profile Mini, Micro-2), two 9 V batteries, foam-padded polypropylene case, user's manual
WarrantyGTC standard 1-year warranty; replacement parts and accessories generally available for 10+ years (maker's page)
Typical applicationsAutomobiles, truck trailers, tractors, farming equipment, boats, forklifts, motorcycles, ATVs and RVs — any 6–42 V DC circuit (maker's page)

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

Alternatives to consider