unrequested changes in the voltage the battery monitor 56 may be configured to include additional features such as an electrical de sulfation device or a low voltage disconnect either the battery monitor 56 or the controller 52 may be configured to provide error information or diagnostic information to an operator at a display 60 which may take the form of leds a display a monitor or by other means either the battery monitor 56 or the controller 52 may be provided to provide historical data to an operator at the display 60 which may take the form of leds a display or by other means or may be stored either locally at storage associated with the controller 52 or remotely for later analysis the display 60 may be located near the battery monitor 56 or at a location remote from the battery monitor the described alternator control systems 40 50 greatly reduce the risks associated with external voltage feedback because they may have two modes of feedback internal and external the alternator 30 used in the system may utilize a conventional internal single voltage regulator 16 which by default receives its feedback internally as described herein the disclosed alternator control systems 40 50 may be able to switch.