Haha god I love stupidity!! Hum I don't know why my fuse looks this way. I am smart enough to see their is a problem. I know lets put a bigger fuse in. Will keep me from blowing the fuse. Wait whats that melting smell coming from my amp? The big a$$ fuse I stuck in their still looks good? Oh look the magic smoke genie has come for a visit!!
Ok enough of me being a a$$. Looks like you have been taxing that fuse fairly hard. I would look at the gauge of wire you are running and the current draw of your amp. Looks like their is a mismatch their. Too small of wire<feeding to large of amp would be my first guess.
My Allis has a big ass!!