The fuse block is located under the right side of the dash. Check the fuse called "INST LPS" fuse # 15, it's the one located in the 5th row across and 3rd one down. If the fuse is good, with the ignition in the on position check for 12 volts at the dimmer switch assembly this is a dark green wire. If you have 12 volts replace the dimmer switch assembly, if not repair the dark green wire. Hope this is helpful to you.
Sounds like u have a ground going to a power wire
This sounds like your headlight switch is going bad. If this was mine, I would play with the switch, pull it out, To turn on the head lights then press in just a bit to see if the dash lights will flicker. If you can get them to flicker that is your problem, bad switch. You will have to get under the dash to remove the switch. Now a little know trick to pulling the switch out and replacing it. On top, on the switch housing is a small push button, press this button and pull out the switch actuator or pull rod. This way you keep your original with the car. Also helps to pull the switch out of the dash as the switch tip will not fit through the dash. Keeps from tearing things up. Hope this helps Fix Ya up.
SOURCE: Hi, My 1988 c4 corvette dashboard
If I'm understanding you correctly sounds like dimmer switch is defetive or there is an open in the circuit. remove dimmer switch from circuit and use a set of jumper wires and jump the circuit connector and see what happens .If light come on when switch is bypassed the switch was the culprit . If not then your into surgery. Gonna need repair manual and do exactly what it says to hunt for the open, lose wire etc.
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