Alternators like the 10-SI style in the picture are self-regulating for current, based on the way the stator is made. They do not need an external current control. That one has a 60 amp stator, which is approximately twice the capacity of the 30 amp generator it usually replaces. The charge rate automatically tapers off as the battery reaches full charge, so most of the time it will be operating in the 5-10 amp range. It has an internal voltage regulator set for a maximum of 7.5 volts, which is also correct for a "6 volt" electrical system. It's "plug and play" if the installation instructions are followed correctly.
Jerry
