GxT Ferret 73 User Manual

OPERATOR’S MANUAL

Secondary Ignition KV Probe 73

FEATURES

To Operate the Unit

1. Turn the unit on. The LED Segments will light up
momentarily, and the Polarity Indicator will remain
illuminated to indicate that the unit is on.

2. Connect the Ground Clip to a good engine Ground.

3. Start and Run the Engine. Note: Some tests may
require the operator to snap accelerate or change the
RPM of the engine.

4. Press fit the KV Clip on the spark plug or coil wire of
your choice. Note: The KV Clip cannot touch any
other ignition wires except the one being tested.

5. Read the KV reading on the Bargraph. If the Coil is
inverted (positive firing) the polarity LED will blink off.

Measurements

When connected to an engine, the LED segments will light
up to indicate the level of Firing KV being detected. Some
Segments will always be on. Some Segments will be on
most of the time, and other Segments will flicker on and
off. The following graph explains what the different LED
Segment behavior indicates.

Analysis of Test Results

If KV is low for one or more cylinders the cause could be:
Open Plug Wire at the Coil (KV will be very low downstream
of the open), Narrow or Fouled Plug Gap, or a Rich Mixture

If KV is High for one or more cylinders, the cause could be:
Open Plug Wire at the Plug (KV will be very high upstream
of the open), Wide Plug Gap, High Resistance in Plug or
Wire. A momentary high KV reading could be an indication
of an ignition miss.

If the polarity light is off on a standard ignition system check
for an improperly installed ignition coil. If the polarity light
is always on when testing both sides of a DIS coil, check
for a bad spark plug wire.

Diagnose improperly installed
coils on distributor ignitions
and assist in connecting large
diagnostic ‘scopes to a DIS
ignitions.

Verify the operation of dual plug
and capacitive discharge (CD)
ignition systems, as well as
Motorcycle and Marine ignition
systems.

20 segment bar graph displays
the KV measurements. Real
time readings make it easy to
find an intermittent misfire.

Powered by a 9 Volt battery.

3 Year Limited Warranty

www.ferretinstruments.com

LED

Segment

Momentarily

ON

LED

Segment is

Momentarily

OFF

LED
Segment is
Always ON

Peak

Firing

KV

Average

Firing KV

Minimum
Firing KV

Technical Support

For additional information or technical assistance, please
contact Ferret Instruments at [phone] or
www.ferretinstruments.com.

SAFETY PRECAUTIONS

• Always wear safety glasses, or other eye protection when testing vehicles. Be extra careful
near batteries and moving parts.

• Battery gas is highly explosive.
a. If a battery explodes, flush the acid away from person's skin with generous amounts of

water. Follow up with a neutralizing solution of baking soda and then more water.
Medical treatment for acid burns may be necessary.

Treat clothing, vehicle parts, and equipment similarly. Any acid traces inside equipment
must be removed by generous rinsing. Dry off equipment afterwards and place in a
warm 50° C (120° F) oven until thoroughly dry.

b. Never use a wrench on the ungrounded battery terminal until the grounded one has

been disconnected. Contact between the vehicle body metal and the "hot" terminal can

cause sparks to ignite gas or even weld tools into a battery short circuit.
c. Keep the space around a battery well ventilated.
d. Do not make sparks or allow flames near batteries.

• Before working on a vehicle, set the brakes and block the wheels. Beware of automatic
parking brake releases.

• Keep your work area well ventilated and free of exhaust. Engine exhaust contains deadly
poisons.

• Avoid electrical shocks caused by getting too close to live ignition wires or touching the coil
TACH terminal. A person's reaction near a running engine can be more damaging than the
shock.

• Keep spark producing devices at least 0.5m (18") above the floor to reduce the hazard of
igniting gasoline vapor.

• Do not let test leads wind up in a fan or pulley. Route leads away.

• Remove finger rings and metal wristbands. They can short terminals and become very hot
from electric current.

FERRET INSTRUMENTS, INC. of Cheboygan Michigan, warrants to the original purchaser that any products manufactured
or supplied by Ferret Instruments, Inc. are free from defects in materials and workmanship for a period of three years from
date of purchase. Our sole obligation for a product within the above warranties will be to repair or replace, at our option, any
defective parts and return the product to the sender within the U.S.A., shipping prepaid, if it is sent to our Repair Depart­ment shipping prepaid and accompanied by proof of purchase. The above warranty is extended for the flashtubes in timing
lights which are within five years of the date of manufacture.

A Ferret product less than five years old according to the date of manufacture, and which is returned with transportation
charges prepaid to: Ferret Instruments, Inc., Repair Department, 1310 Higgins Drive, Cheboygan, MI 49721, will be
repaired or replaced, at factory option, for a service charge not to exceed 40% of the latest factory suggested user price;
plus return transportation charges and insurance. If the product has been discontinued, the nearest equivalent product may
be substituted.

FERRET INSTRUMENTS LIMITED PRODUCT WARRANTY

EXTENDED SERVICE POLICY

This Warranty and Extended Service Policy do not apply to products which have been altered outside the factory; or
repaired by anyone other than the factory or its authorized service centers; or which have been damaged from accidents,
negligence, or abuse; or have been used differently than described in the printed instructions. Please note that wear and
tear on leads and replacement of consumable (paper, oxygen sensors, Nox Sensors, etc.) items, is not covered by warranty.

Ferret Instruments, Inc.'s sole liability and buyer's exclusive remedy is limited to repair or replacement of the product as
stated in the Limited Product Warranty and the Extended Service Policy. THERE ARE NO OTHER WARRANTIES EX­PRESSED OR IMPLIED INCLUDING THOSE OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
AND FERRET INSTRUMENTS, INC. SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARIS­ING FROM THE SALE OR USE OF THE PRODUCT.

Some states do not allow limitations on the length of implied warranties nor exclusion or limitations of incidental or conse­quential damages, so that the above limitations and/or exclusion may not apply to you. This warranty gives you specific
legal rights and you may also have other rights which may vary from state to state.