Master Switch

Check power source line to switch connector.
Inspect the power source line between terminal B and the body ground of the wiring connection.
Inspect the ground connection.
Inspect the ground connection between terminal E and body ground of wiring connector. See Fig 1 .

Fig 1: Identifying Control Switch Terminals
Courtesy of CHRYSLER CORP.
Test switch for continuity. See Fig 2 .

Fig 2: Master Switch Continuity Reference Chart
Courtesy of CHRYSLER CORP.