An electrical connector for use in a connector assembly, the electrical connector comprising a housing and a terminal position assurance device, the housing including a front surface for mating with electrical connector of assembly, a rear surface, contact receiving channels included with housing and extending from the front surface to the rear surface, contacts contained within the contact receiving channels, the contacts comprising a mating end and a terminating end for connection to wires or cables which extend from the rear surface of the housing; the terminal position assurance device comprising: a terminal engaging section having a first end, an oppositely facing second end and legs configured to be received in contact receiving channels; an engagement section comprising a raised section which extends from the first end in a direction away from the second end, the engagement section comprising a bearing surface spaced from the first end of the terminal engaging section, the bearing surface having a width, in a direction extending from a first side to a second side of the terminal position assurance device, which is greater than a width of the terminal engaging section in the direction extending from the first side to the second side of the terminal position assurance device, wherein the raised section comprises a support surface spaced from the bearing surface and extends at least part of the length of the terminal engaging section; characterized in that the terminal position assurance device further comprises wire receiving channels extending from proximate the bearing surface to the support surface of the raised section and configured to align with legs and contact receiving channels to allow wires to extend through the aligned channels (38, 66) and the bearing surface is configured to allow an assembler to push the terminal position assurance device to couple said terminal position assurance device with the rear surface of housing during assembly of the electrical connector with a thumb or finger without significant interference from wires extending from the rear surface. a terminal engaging section having a first end, an oppositely facing second end and legs configured to be received in contact receiving channels; an engagement section comprising a raised section which extends from the first end in a direction away from the second end, the engagement section comprising a bearing surface spaced from the first end of the terminal engaging section, the bearing surface having a width, in a direction extending from a first side to a second side of the terminal position assurance device, which is greater than a width of the terminal engaging section in the direction extending from the first side to the second side of the terminal position assurance device, wherein the raised section comprises a support surface spaced from the bearing surface and extends at least part of the length of the terminal engaging section; characterized in that the terminal position assurance device further comprises wire receiving channels extending from proximate the bearing surface to the support surface of the raised section and configured to align with legs and contact receiving channels to allow wires to extend through the aligned channels (38, 66) and the bearing surface is configured to allow an assembler to push the terminal position assurance device to couple said terminal position assurance device with the rear surface of housing during assembly of the electrical connector with a thumb or finger without significant interference from wires extending from the rear surface.