98 chevy suburban. tail lights and dash lights wo’t work

I have no tail or dash lights when I turn light switch on. All other lights work, daylamp, headlamp, highbeams, brakelights, all signals, reverse, flashers, interior.

Checked: fuses, taillamp wiring, dash control switch.

What else can I troubleshoot. I checked the Hayes manual. I’m stumped.

Thanks