Rebuild or Replace Alternator

[Al]

My last trip I noticed my alternator was not charging. Had to start
generator up and connect our start / house batteries together to
maintain the starting batteries. We put a volt meter on the alternator
and got no charging reading. Any other tests that we should do? I
researched the rest of the post and looks like one person had the unit
rebuilt. What is best rebuild or replace? I have 8 house 6 volt house
batteries and 2 starting battteries. I think I should increase my
alternator sizing so the battery bank is charged faster while under
engine power. Any recommendations?

Al, Kathy, Alfred and Daniel Johnson
'96 BMC B50
Mandeville, Louisiana