Fuses not getting juice

I recently tested the fuses on the panel to the left of the brake pedal on my 90 LS auto. I used a test light and i noticed that the two bottom rows of fuses are not busted yet they dont produce a light. Although the fuses in the top 2 rows produce a light no problem. I seem to be able to use everything on the car like the lights, cd, sunroof etc, but I am having a problem where the car will not shift into 3rd gear. Can anyone post what these fuses are used for? and if anyone knows why there not getting juice.