How to I Charge Two Different Voltages With One Alternator on My Boat?

"Hi Jeff," writes Bob. "I want my alternator to charge my starter battery and then charge my 24v (dual 12v) batteries when out cruising. If I purchase a 3-battery isolator, will that work? Or is there a better solution?"
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[@Electronzap]

Good info.

[@davidboily2424]

Hi Jeff, Here's a couple of questions for a future video. Question #1: I am going to replace my classic battery switch (1, both, 2, off) with an ACR and simple on/off switch, however my house bank and starter batteries are of different types (Group 31 Trojan AGMs vs. group 31 West Marine Lead acid). Is this a problem? Question #2: Should I install my battery charger on both the house and starter batteries separately like it is now or just on the house bank? thanks. Love the vids :)

[@stevehunt2115]

hi Jeff, I have 2 battery banks (4xhouse and 1xengine) and two alternators all connected with 2 Argofet 100-2 battery isolators - can I connect dc to dc charging convertors (on the output from the argofets) to get the modified charging profiles to optimise charging?