This is my fuse box, the smaller pull is for the ac, stove and dryer. Right now it has 2 60 amp fuses in it. I was told this was causing the over heating of the main 100 amp fuses the top pull out. I was told to change them to 30 amp fuses. The reason I am asking is the main fuse was completely gone but was still making a connection so we didn't lose power the lights just started blinking. Went in and checked the fuses and the main pull was extremely hot. The fuse was all but gone the end fell off when we removed it, what could cause something like this? It is an older fuse box maybe 1971 or before Murray panel. ANY advice is appreciated.