Given a choice, I would not use a "fuse" (or circuit breaker) of any sort in the alternator output cable. GM protects that cable with fusible link wire, which withstands short-term overloads that would pop a fuse or circuit breaker.
When that cable "opens"--the fuse, circuit breaker, or fusible link goes "****", the voltage spike may kill the diodes in the alternator. Clearly, you don't want that cable to open unless it REALLY needs to. [Really? "Po of" is a banned word?]
For many years--decades, even--GM did not provide any sort of protection on that cable.