Fusable link questions

73 duster 340 was a slant6 car with column [ auto] i coverted to floor [auto] steering column is from a floor shift car 73 also. the key switch works some times but most of the time i jump the soliniod the amp meter sometimes goes to H when i turn on the fans it goes just past the middle so what causes the fuseable link to get so hot but not blow
being on the ragged edge of too much load

are the fans wired off a switch, that is wired off the fuse block, that has NO relays carrying the current?
got a kickin' stereo?
looked at the
bulkhead connectors?
fuse block?
steering column connector?

bet you have some melting plastic

good luck :)