The fuse block should have the name of the destination for the fuse on the face of it or at least mine does. As far as the rating of the fuse try and look in a chiltons manual and if you dont have one that should be the first thing you buy!!
__________________
93 x-cab 4x4 dually. 14mm nonwastegated exhasut housing 4 inch exhaust; fuel pin screw alomost all the way in; old smokey pin; Coaltrain custom injectors 366 spring and a grid heater gutted. Coming soon coaltrain twins!!!!YEA
