It's usually the regulator under the seat that fails, not the alternator inside the engine cover on the left side. This failure is common and there are a few options to the factory regulator. Electrx makes the preferred replacement, so google them.
The elctrical problems that have been discussed and dismissed
by you previously can cause repeated regulator failure as well as battery boil over.
Read the thread on starting and you can begin to get an idea of the cause. The addition of the relays is fairly easy to peform and is reversible if you want to return it to original.