1995 Ford Windstar

Check/replace the ignition switch.

IGNITION SWITCH
To inspect ignition switch for mechanical operation, rotate lock cylinder through all switch positions. Lock cylinder should not bind, and should return from START to RUN position without assistance.
If binding or incorrect modes occur, ignition switch should be adjusted. After adjustment, if binding or incorrect modes still exist, lock cylinder should either be disassembled and inspected for damage, or ignition switch should be replaced.

IGNITION SWITCH
Ignition switch is properly adjusted if:
In ACCESSORY, accessory circuit is operative and steering wheel is locked. Automatic shift lever cannot be moved.
In LOCK, all ignition switch electrical circuits are inoperative and steering wheel is locked. Automatic shift lever cannot be moved.
In OFF, all ignition switch electrical circuits are inoperative and steering wheel is unlocked. Automatic shift lever can be moved.
In ON (RUN), all ignition switch circuits or accessory circuits are operative except starter circuit and warning light check circuit. Steering wheel is unlocked and automatic shift lever can be moved.
In START, only engine ignition, warning light check, and starter circuits are operative. Steering wheel is unlocked and automatic shift lever can be moved.
Ignition switch is not adjustable. If ignition switch requires adjustment, replace switch.