Abstract: Electrical connectors include an insulating housing having terminal-receiving cavities in which conductive terminals are inserted and retained. When a terminal is inserted to a home position in a cavity, a primary lock structure formed on the terminal and on the wall of the cavity is effective to retain the terminal in place. A secondary lock structure is provided by a hinged door of the housing. In order to prevent inadvertent incomplete terminal insertion, the door cannot be closed until the terminal is fully inserted into the home position. If the terminal is spaced substantially from the home position, the terminal blocks movement of the door to its closed position. If the terminal is near the home position, the door advances the terminal into the home position.