This disclosure describes charging input selector systems for electrified vehicle charging systems. An exemplary charging input selector system may include one or more selector units movable between a first position that is displaced from an on-board charger unit and a second position that is in contact with the on-board charger unit. When the selector unit and the on-board charger unit contact one another, an on-board charger module electrically connected to the on-board charger unit may receive power from a charging input for charging a battery pack. When the selector unit and the on-board charger unit do not contact one another, the on-board charger module cannot receive power from the charging input. The selector unit may be passively moved between the first and second positions using the insertion force of a connector of an electric vehicle supply equipment (EVSE) assembly.