A method of assembling an electrical connector (1) comprises the steps of: preparing a dielectric housing (2) defining a plurality of insertion slots therein; preparing a conductive contact strip (3a) comprising a plurality of contacts (3) and a carrier (3b) connecting with the contacts; preloading the contact strip into the housing; inserting a spacer (5) into the dielectric housing to position the contact strip, the spacer being inserted between an inner side surfaces (210) of the housing and mating portions (31) of the contacts; pulling the contact strip downwardly via a tool (4) gripping slots (35) defined in opposite sides of end portions (36) of the contacts; removing the spacer from the dielectric housing; severing the carrier and end portions of the contact strip; and bending mounting portions (34) of the contacts in an alternating manner.