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
doing a continuity check).
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
the Kubota Workshop Manual, Diesel Engine, V2003--T
Series at the end of Chapter 3 -- Kubota Diesel Engine.
Ignition Switch
The ignition (key) switch has three positions (OFF, ON/
PREHEAT, and START). The terminals are marked as
shown. The circuit wiring of the ignition switch is shown
in the chart. With the use of a multimeter (ohms setting),
theswitchfunctionsmaybetestedtodeterminewhether
continuity exists between the various terminals for each
position. Verify continuity between switch terminals.
A
B
Y
S
X
POSITION
OFF
CIRCUIT
NONE
I
ON / PREHEAT
START
B + I + A, X + Y
B + I + S
2
1
4
3
Figure 3
1.
2.
Key
Hex nut
3.
4.
Lock washer
Ignition switch
OFF
45
°
ON / PREHEAT
45
°
START
Figure 4
Electrical System (Rev. A)
Groundsmaster 4500--D/4700--D
Page 5 -- 7
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