Hi there,I always go to the switch first,so you can shut off the AC when you change the fuse,otherwise you're putting a fuse into a "hot" line. It doesn't show it properly,but in the schematic one side of the neon bulb in the on/off sw. is connected to the sw. The end result is even if the fuse blows,the neon will stay lit,but you can change it safely.Good luck,Mel.