'99 S-10, no dash lights

The dash lights use to work then they quit. Any suggestions what and where to test to find my problem.

Have you tried working the dash light brightness/interior light switch?

Yeah I have the same problem on my 94 s-10. I posted on s10forum.com and all they could seem to say was check that damn dimmer swich as well... I cant seem to isolate my problem and have had the dash apart 2x since the prob. My issue happened when I went to turn on my head lights after running some RCA wires behind the dash. I suspect that some wire got pulled out somewhere or something but its devloping into a huge headache. I feel for you lol!