INSTRUMENTATION SERVICE MANUAL NUMBER 22
Page 4D-16 90-860074--1 FEBRUARY 2002
TESTING
1. Before testing key switch, check all fuses and/or circuit breakers in electrical circuit that
could prevent operation of starter.
IMPORTANT: Disconnect battery cables from battery before testing ignition key
switch with wires still connected to switch.
2. Disconnect battery cables from battery, if proceeding to test switch with wires still
connected. With key switch in the “OFF” position, there should be no continuity between
switch terminals.
3. With key switch in the “RUN” position, continuity will exist between switch terminals B
to I. There should be no continuity between terminal S and any other terminals.
4. With key switch in the “START”, continuity will exist between terminals B to I and B to
S.
5. Terminals are to make contact at angles shown and to stay in contact condition as switch
is rotated toward the “START” position.
6. If ignition key switch tests bad, unscrew or unsolder wire connections and remove
switch. Test switch again. If switch tests good, wiring in harness is bad. There should
be no continuity between any switch harness wires with key switch removed.
74103
B
S
I
a
b
c
d
e
f
h
g
a-Key (Front) View
b-Back View
c-Key
d-OFF
e-Continuity B to I Terminals
f-RUN
g-Continuity, B to S Terminals
h-START
Position
B to I B to S
OFF No Continuity No Continuity
RUN Continuity No Continuity
START Continuity Continuity
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