Hi Ben, Is your alternator a Balmar?  If so I believe that it is externally regulated.  I have experienced a couple of broken wires on my unit that were very easy to repair.  They were not Balmar problems but the result of bad crimps when installed.  Also, my unit does have an inline fuse.

Regards,
Will Stout
Anni Bea True
SM180
Marina Fort Louie
St. Martin, FWI