fuse assembly/fusible link heat question

[dwbiggs]

My buddy has a 66 Bird and he recently noticed that with his headlights on his fuse assembly (fusible link), mounted right behind the battery on the inner fender, is heating up pretty good. If he switches on the high beams it gets very hot. He switched over to halogen headlights...could this be the problem? If so, does he need to put a resistor in the circuit?

Thanks!