Oh dang, I know I posted a reply in this forum a couple of weeks ago, i wonder why it didnt show up.
Problem: it was due to poor contact on the fuse holder. With all those amps flowing though, if it doesnt have a good surface contact, it will arc and melt.
Fix: The best thing to do is solder the wires directly onto the fuse itself. Get a fuse rated for 5 amps higher than normal so it wont blow from normal use, but will keep it protected incase there is a big-short. Slide the wires through the fuse holder (if still intact), cut the connectors and strip the wires, solder the fuse and slide it back into the holder.