Yes, more or less right. The alternator regulator and the converter / charger control charging.
Typically, the current flow would be like this:
Engine -> 12V DC Alternator -> Isolator -> House Battery
or when Onan running or if plugged into grid power:
110V AC Source -> Converter / Charger -> House Battery
The two systems are separate in that the Converter doesn't use the Alternator and vice versa.
When the specific term Charge Controller is used in RV's it is typically in reference to solar charging.
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