Using 2 batt banks for the house is no longer considered good practice, as the larger combined bank suffers less from the electrical draw.
Using a rotary switch to combine the house and start banks for an emergency start is still good practice .
With one alt the start and house are combined , after engine start with a solenoid or an electric gadget.
A SOC meter is the only way to know State of Charge and keep the house batts happy.
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