Running Lights - Tail Lights not working on 1993 GMC Sonoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The running lights do not work anymore and I have checked all the fuses and wires.
(1) Answer
it could just be that the bulbs are out, replace the bulbs and see if the running lights work after that.