Battery isolator after the mppt

Good morning, I was thinking of add a battery isolator after the mppt to charge the battery packs, services and engine on a boat. Could it work?

Not sure exactly what you mean, male a sketch, photograph it with your phone and upload.

i want charge two separate battery with one mppt

So a changeover / combiner switch or two isolator switches, I understand now. Yes that will work as long as both batteries ate the same voltage and need the same charging settings.

the batteries are the same
thank