Ignition Switch Continuity Test
- Test ignition switch operation by rotating cylinder/key through all switch positions. Movement should feel smooth, without sticking and binding. Cylinder/key should return from START position to RUN position without assistance. Inspect and repair if necessary.
- Remove instrument panel lower cover. Unplug connector from ignition switch. Connect a self-powered test light or ohmmeter between blade terminals indicated in following steps. See Fig 1
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Courtesy of FORD MOTOR CO.
- Continuity between any blade and chassis ground should not exist in any switch position except proof circuits in START position. With ignition switch in ACC position, continuity should exist between terminals A-1 through B-5 only.
- With ignition switch in LOCK and OFF positions, continuity should not exist.
- With ignition switch in RUN position, continuity should exist between terminals A-1 and B-1, A-2 and B-2, A-3 and B-3, A-4 and B-4, and I-1 and B-5.
- With ignition switch in START position, continuity should exist between terminals I-1 and B-5, I-2 and B-1, STA and B-4, P-1 and GND, and P-2 and GND.