GxT Ferret 54 ENGINE DIAGNOSTIC CENTER - Manual (Page 16)

2-3
PRIMARY AMPS PICKUP - DIS
Put the black Primary Amps Pickup around
the wire that provides 12V power (B+) to the
ignition module and all coils. You may
hookup around the wire anywhere in the
wiring harness, but be sure the pickup is
around the wire that carries only the ignition
pulses, and not the fuel injector pulses. The
pickup label must face toward the battery
plus end of the wire (away from the coil). See
the chart on page 4-4 for typical wire colors.
Refer to the manuals or car wiring diagrams
to find the correct wire for the Primary Amps
Pickup hookup.
For Distributor engines, this probe is
needed only when a clip connection to the
coil (-) wire is not available, as with some
integral coil ignitions.
INDUCTIVE AMP PROBE
The primary application for the Inductive Amp
Probe is the measurement of starter draw
and alternator output current during battery
testing. For these tests, connect the probe
around the negative battery cable with the
arrow pointing away from the battery.
The arrow on the probe indicates the
direction of conventional amps that will give
a positive display reading. Reversed amps
will show a minus reading. For example, if
the probe is on a negative battery cable with
the arrow pointing away from the battery, the
reading will be negative when discharge
amps flow.
For accurate readings, the amp probe must
be zeroed while being held away from wires,
alternators, or other sources of magnetic
fields.
The probe has a reading range of
±
600 amps
DC in 1 amp steps and can also be used to
measure vehicle accessory currents. Placing
the probe on the battery cable, while the
engine is off, and then watching the change
when operating switches, allows the
checking of many loads rapidly.
Primary Amps Connection
12 V
BATTERY
COIL DRIVER MODULE
PRIMARY
AMPS
Amp Probe Connection
AMP
PROBE
BATTERY