My airplane came with the 60 amp alternators, and the Zeftronics regulators installed. There doesn't seem to be any adjustment available, but I don't get any weird flickering lights.
I do have a volt meter and dual ammeters. She's pretty stable, has about a 10amp draw with everything turned on.
One observation I've made is that a good charge in the battery seems to make the whole thing run nicer. If the battery is low for one reason or another, the front alternator will output a much higher voltage, to the point where it can kick the rear alternator offline.
If I've been away for a period of time (I travel a lot due: work) I make a habit of pulling the battery and throwing it on charge for an hour or so. A battery minder would probably be a good investment.
Leighton.
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