Brake lights not working

Have a 1998 Z71. Brake lights dont work, but third brake light works. Bulbs and wires are good.

bad turn signal switch.

how do you check the turn signal switch?

fixed it, it was the big 30 amp fuse under the hood. it didnt look blown, but i switched it with another one and the brake lights worked just fine after that.

I have a 94 suburban, and my tail lights all work fine except my brake lights do not work when I push the brake pedal. I replaced the brake actuator/interuptor switch, and checked the fuses. Is there something I am overlooking, if so What is it and where is it located? Thanks