94 Sonoma Dash Light Failure

I have a 94 Sonoma which has lost its Dash Lights. When the headlights
are turned on the Dome light at the rear of the cab lights up but no
dash lights or floor lights. If I increase what should be the dash
light brightness, no change until the interior lights change from the
dome light to the floor lights at the where all dome lights should be
on. I have checked all of the fuses.


Suggestions?