Dash light don't work - 1996 Toyota T100

Switch could be prob, check fuses first.

yes ,
check the fuses.

is battery good, check fuseable links under the hood and the light switch itself..

Check all fuses and replace any that are blowen.

These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse.
Do you have power going into the headlight switch and the brake light switch ?

sometimes when one of your bulbs is out it does that to all off the start with your turn signal bulbs other wise its you regulater fuse located under the hood

The tail lights are usually on the same fuse as your dash lights. Check to see if you have tail lights. If they are on and it's only your dash lights that don't work, check the dash dimmer switch for a fault.

I suggest you check the dash light dimmer control by the headlight switch it may be turned off or defective.

I have a 2003 Buick lesabre limited my inside lights don't work

Turn the headloights on and see if the tail lights work, if not check the fuse inside at the left lower dash under the cover, check the fuse marked "tail", the tail lights are working then the problem may be the rheostat switch, make sure it's turned to the brightest setting, if the dash lites still don't work let me know.