2000 Ram 1500 Sport. My interior lights ( map, dome, and cargo) will not work. I am not getting power to them and all fuses are fine. How do I fix this?

 

Grab the 01 service manual from here. Wiring diagrams are in section 8W. The various switches provide ground, since you have power, problem needs to be on the other side. Look for commonalities in just where the various systems ground. since none of them are working, might just be a loose wire somewhere.