The body computer is in control of the interior lighting.
Owners manual will tell you. Owners manual will not tell you for a 2003 Town and Country. Back of the fuse box cover has a very generic description, but does not explain which fuse controls interior dash lights.
Possible headlight switch. Try wiggling the controls to see if it stop or gets worse.
not to sure but on my vectra it normally controls the interior lights, but you have to pull the switch out to put the interior lights on
It controlls the theft alarm, interior lights, wipers, part of the hvac system, cluster, etc.
check the battery and or alternator
The interior lights are controlled by the headlight switch and are protected by a fuse.
which fuse controls the lift gate or interior lights on a 2003 ford expedition
The body computer controls the lights, door locks, wipers, part of the theft alarm, keyless entry,
Distance indicators for the backup sensor system.
Radio memory, interior lights, memory seat functions,Radio memory, interior lights, memory seat functions,
in the fuse box
Should be parking/tail/dash lights on a common circuit