1990 3.9 2wd auto..............
noticed last night my light in the headliner over the back seat and the light in the rear view mirror were on. fiddled with the button switch in the door jamb and the switches on the lights but in the end had to remove blub and disconnect the mirror light to get them to go out. any thoughts where to start looking?

 

One of the switches failed or a short in the wiring. Unplug 1 switch at a time and see what happens.