Component Testing
For accurate resistance and/or continuity checks, elec-
trically disconnect the component being tested from the
circuit (e.g. unplug the wire harness switch connector
from switch before doing a continuity check on switch).
CAUTION
When testing electrical components for continu-
ity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.
Ignition Switch
Theignition(key)switchhasthreepositions (OFF,RUN,
and START) (Fig. 5). The switch terminals are posi-
tioned as shown in Figure 6.
OFF
45 o
RUN
Testing
45 o
1.
Make sure that Processor ignition switch is in the
OFF position. Remove key from the ignition switch.
START
2.
Unplug wire harness connectors from switch and
verify continuity between switch terminals. The circuitry
of the ignition switch is shown in the chart below. With
the use of a multimeter (ohms setting), the switch func-
tions may be tested to determine whether continuity ex-
ists between the various terminals for each switch
position.
Figure 5
3.
ter testing.
Reconnect the harness connectors to the switch af-
L
M
B
S
POSITION
CIRCUIT
G + M + A
B + L + A
B + L + S
G
A
OFF
RUN
Figure 6
START
HEX NUT
KEY
SWITCH
LOCK WASHER
Figure 7
ProCore Processor
Page 5 -- 7
Electrical System
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