An electrical connector comprising an insulating housing (11) receiving two contacts (22) having wire receiving slots (24) at one face of the housing (11) and pairs of resilient contact arms (23) at the other face of the housing (11) adapted and arranged electrically to connect to the electrodes (29) of a wedge-base lamp (28). Resilient fingers (19, 21) integrally formed with the housing (11) extend across the slot mouths (25) enabling wires to be trapped in the mouths (25) prior to insertion in a wire connecting portion (26) of the slot (24). This enables harnesses to be traced on panel boards (31) prior to connection.