An electrical connector assembly includes a housing having more than one cavity extending along an insertion axis for inserting a connector in each of the more than one cavity. The housing has a slot extending perpendicular to the insertion axis and the housing has a locking chamber therethrough including a first section and a wider second section. A retention lock is inserted into the slot and held within the housing. The retention lock has a split center post with a top latch and the retention lock passes through the locking chamber so that the top latch locks within the wider second section of the locking chamber. The retention lock locks each of the more than one connector within each cavity.