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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,892 Posts
I agree. The tip of the key pushes a plunger to close the key-in switch. Aftermarket or worn keys might not push far enough.
The older switches could be serviced by bending a contact tang slightly. The newer switches may be more tamper-proof and not really accessible.
The other half of the equation is the drivers door ajar switch staying open (the switch, not the door). If the drivers door always looks closed, the key-in warning won't work. It may be a separate switch than the courtesy lamp switch.
 
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