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 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 more component testing information, see
the Kubota Workshop Manual, Diesel Engine, 05 Se-
ries.
Ignition Switch
The ignition (key) switch has three positions (OFF, ON/
PREHEAT, and START). The terminals are marked as
shown.Thecircuitry oftheignitionswitch isshown inthe
chartbelow.Withtheuseofamultimeter (ohmssetting),
theswitchfunctionsmaybetestedtodeterminewhether
continuity exists between the various terminals for each
position. Verify continuity between switch terminals.
A
Y
B
S
I
SWITCH
POSITION
NORMAL
CIRCUITS
OTHER
CIRCUITS
X
OFF
ON/PREHEAT
START
NONE
B + A + I
B + S + I
NONE
X + Y
Figure 4
NONE
3
2
1
4
Figure 5
3.
4.
1.
2.
Switch
Key
Hex nut
Lock washer
OFF
45
°
ON/PREHEAT
45
°
START
Figure 6
Groundsmaster 3500--D
Page 5 -- 9
Electrical System (Rev. D)
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