The wire acts as a fuse? I thought the purpose of the fuse was to protect the wire. Putting an ANL fuse on the wire from the master contactor is a good idea. I was just about to rewire my alternator as suggested in aeroelectric to go to the battery contactor instead of the main bus using an ANL fuse, so maybe I'll get two and add one to the main cable as well. I'm trying to switch my plane from a main/avionics bus to a main/essential bus with alternate feed switch. I do find it interesting that even in the aeroelectic diagram the essential bus wire from the battery has an ANL fuse, but the main doesn't??