My interior light want shut off in my buick century2001 and its running my battery down

SOURCE: 1999 Ford Expedition Interior overhead lights stay on, door locks

locate the relay for the interior lights and doorlocks and replace it.

Robert

SOURCE: the interior lights stay on and the door ajar

Find the lamp push button on each door.
Open one door, and only one door (or tailgate).
Push the lamp button IN at that door. If light goes out, then that particular push switch needs adjustment or replacement.
Cl;ose door and open another door. Push button IN.
Keep doing this until you find faulty door push button.

Which door was it?

SOURCE: I have a 97 Buick LeSabre that the interior lights

Sounds like your dimmer switch is going bad.It may or maynot be part of the headlight switch assembliy. Looked up the part and there are many.Well good luck.

SOURCE: Interior lights will not go out unless the car is running

adjust your interior lights from your turn signal arm

SOURCE: My jeep just shuts down

HELLO, I'M PRETY SURE YOU ARE HAVING A PROBLEM WITH YOUR VOLTAGE REGULATOR. PROBLEM IS THAT YOUR REGULATOR, IS INTERNAL IN YOUR ALTINATOR AND THAT IS WHERE THE VOLTAGE REGULATOR IS LOCATED. TAKE YOUR ALTINATOR TO YOUR NEAREST AUTOPARTS STORE AND HAVE THEM TEST IT. HOPE THIS HELPS YOU.