Do you guys know if the alternator charges all the batteries all the time?

I was under the impression that the selector switch effectively directed
all the current from the battery banks including charging from the
alternator and I usually run on "both" to make sure all the batteries get
exercised.  Now that I might be looking for a new charger (Different story)
and I'm looking into this charging thing deeper / I'm reading on the web
that the alternator might actually be charging both all the time regardless
of the switch position?

We mostly daysail and don't require much from the batteries so I thought it
would be a good idea to have them all involved both in charging and
discharging so I typically use the "Both" option on the switch.

Now I'm thinking I should maybe just use position 1 except when at anchor
or for extended night cruises?

Thanks,

Francois Rivard
1990 34+ "Take Five"
Lake Lanier, GA
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