So I was looking at my anl fuses the other day and reliezed the one from my battery is only a 100a and then th ones my distro block were 50a's I know I need to replace at lease the one to my sub amp when I get my sa-12 but I figured I should also get a new one for my battery too. How would I figure out what size to use? My amps fuse rating are the fallowing. Sub amp 140 (2x 70a) and my miss high amp is a single 40a so 180a total, but I don't use my mid highs to the fulliest I have the gains set to about 1/16 and only using 2/4 channels so I think the 50a fuse is good there. If anyone can tell me a good way to figure it out or suggest a fuse size that would be great. I don't hav a local audio store and nowhere close to me sells fuses so I don't want to pop them.