The Sure Power Battery Separators are designed for use in multi-battery applications as a solenoid priority system to protect the chassis charging system from excessive loading while allowing auxiliary batteries to be charged. The Sure Power Battery Separator has a delay function incorporated in the control circuit to prevent the Battery Separator from reacting to momentary voltage fluctuations and chattering. The priorities of the Sure Power Battery Separators are to assist in engine starting (if required), and to protect the charging system from excessive power drain.