The battery / alternator shop (which supplies a lot of the local
boatyards) assured me that the AGM batteries would do just fine with
the stock alternator/regulator. Since they easily could have sold me
a new one, I'm inclined to believe them.

If this was a power boat, I might still be inclined to look for a more
sophisticated charger. The 35 amp alternator isn't going to run
enough to do much charging on our sailboat anyway. I'll be putting in
a good shorepower driven charger with three step charging so that is
what the batteries will mostly see at the top end of the charge cycle
where it is most critical.

--

Roger Long