Abstract: An electrical connector assembly has an insulator housing which includes a terminal holder and a housing cover for the terminal holder. The terminal holder supports elongated electrical terminals on a longitudinal platform which has a plurality of longitudinal fingers at the forward end and a plurality of partition walls at the rearward end which define terminal receiving channels which are associated with respective fingers. The elongated electrical terminals are laterally inserted into the terminal receiving channels and retained on the terminal holder by pairs of spaced, deflectable latch arms of the fingers. The housing cover has side walls and guide walls which prevent full insertion of a terminal holder having an improperly assembled electrical terminal and which hold the deflectable latch arms in terminal retaining positions when a terminal holder with properly assembled terminals is fully inserted in the housing cover.