Alternator and wiring upgrade

[Tsoptich83]

I'm having an issue figuring out if when you upgrade the alternator, do you have to upgrade the fusible links and wires from the starter and alternator? If I upgrade from the 78amp alternator to a 100 amp or larger is it acceptable to upgrade the wiring to 4 gauge and replace the fusible link for the alternator to a mega fuse and run 4 gauge cable to the starter with out a fuse at the starter? (That's how it's done with the 3g upgrade in the fords) Correct me if I'm wrong and thanks in advance.

Thomas