Q: all my dash gauges and idiot lights are working but i have no dash lights on 1990 Chevrolet Astro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
someone told me it might be a four-prong relay. Do you have a location and test method? Bulbs are all ok
(1) Answer
there is a separate 7.5 amp fuse for the dash light. they work off the headlight switch.

how do you know the bulbs are good??