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This is pretty much where we part company as all my machinery more or less pre-dates alternators, (as do I for that matter!)

That said an alternator produces an AC output which ‘aint much use to a battery — it’d confuse the hell outa the poor thing!

Therefore there has to be something, probably diodes, that convert the AC output to DC and I’d lay odds that there is some form of solid state voltage/current control in there somewhere too.

Alternator or dynamo — apply rotative power and you get electricity out, switch something on and you use electricity, what you see on the ammeter will be pretty much the same.