Component Testing
For accurate resistance and/or continuity checks, elec-
trically disconnect the component being tested from the
circuit (e.g. unplug the ignition switch connector before
checking continuity on the switch).
CAUTION
When testing electrical components for continu-
ity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.
NOTE: For engine component testing information, see
Engine,
V2403--M--T--E3B Series at the end of Chapter 3 -- Ku-
bota Diesel Engine.
the
Kubota
Workshop
Manual,
Diesel
Ignition Switch
The ignition (key) switch has three (3) positions: OFF,
ON / PREHEAT and START (Fig. 7). The terminals are
marked as shown in Figure 8. The circuit wiring of the
ignition switch is shown in the chart below. With the use
of a multimeter (ohms setting), the switch functions may
be tested to determine whether continuity exists be-
tween the various terminals for each switch position.
Verify continuity between switch terminals.
OFF
45°
ON / PREHEAT
45
°
START
POSITION
OFF
CIRCUIT
NONE
ON / PREHEAT
START
B + I + A, X + Y
B + I + S
Figure 7
A
B
Y
S
X
I
Figure 8
Groundsmaster 4000--D
Page 5 -- 9
Electrical System
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