Tail Lights/runninglights and dash lights don't work

My tail lights and dash lights are both out. The brake lights still work and the bulb has 2 elements. I checked fuses and didn't check every one but all of the ones that had something in their description that looked related to the tail lights. My headlights still work and I tried to check out the headlight switch but it is only accessible from behind the dash and I cant get to it because of all of the other wiring and stuff back there. Any hints on other things to check or how to check it?