Mostly people refer to charge controllers as something that regulates the output of solar panels
is the term used with alternators. A regulator
can be a smart 3 stage regulator or just a voltage controlled regulator.
It is highly unlikely that your alternator is not regulated. If your batteries come up to 14.2 volts (+/- 0.2 volts) and remains at that voltage while you are motoring, then you have the same regulator that is in your car, voltage regulated.