I have a1996 Ford Crown Victoria and the interior lights work at times and at other times they do not. This auto has the fade in fade out interior lighting system

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem 2008 crown ford Victoria

See if this site has one:
http://www.bbbind.com/free_tsb.html don-ohio

can be seen here:
2001 Ford Crown Victoria Owner Manual Page 158 http://www.manualowl.com/manualswf.php?id=1289&manual_type=auto&d=bced2dacb3b142024bde8584f72ef81d

I thought someone might have moved gas tank so I removed skid plate

have your altinator checked. most auto part stores will do it for free.

This is normal, your car is equipped with Daytime Running Lights so just the headlights will be on at all times. Its a pointless safety feature.

Open one door at a time and press the door button-switch (in the door-frame, hinge side usually) to see if that switch will shut off the light. If you find one that does, either extend the button length slightly with hot glue or epoxy, or replace the switch. Make sure the light has not been turned on at the light or that the switch is bad.

Sounds like the multifunction switch. Try working the hazard switch up and down a few times to see if you get some lights to work. If so then replace the switch.

you need to get into trunk take the interior trim cover off the side light is off on. then take the back of the bolts out and pull the light out should be any fix