If these dynamos are to be used as a 12-volt system, they must be able to operate at more than 12 volts, and the regulator set point voltage must be between 14.1 and 14.8 volts, which is why the alternator may be replaced by a 12-volt alternator. Be known as a 14 volt alternator. This alternator has a power supply that all consumers have 12V and 24V versions. In general, the alternator must turn on at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12-volt car battery. If the alternator gives too much voltage (15 volts), it is likely that your battery acid will boil from the battery. Marine Land has the best for you.