Abstract: A device for providing strain relief between an electrical connector and a wiring harness having wires or cables already joined to the contacts of the connector includes a T-shaped plate having axial and transverse members and a pair of opposing, inwardly facing, U-shaped structures disposed at opposite ends of the transverse member and extending at a right angle to the plate from a front edge thereof. The device is mounted on the connector with the U-shaped structures respectively straddling a corresponding mounting flange of the connector and a distal end portion of the axial member extending rearward over a portion of the harness extending rearward from the connector. The two rearward extending portions of the plate and harness are cinched together with a strap or the like. The device can be installed after the harness has been assembled without the need to remove the wires or contacts from the connector.