Abstract: A high voltage interlock (HVIL) plug assembly includes a main body having an outer surface and an inner surface configured to be disposed against a cover of an electrical device, wherein removal of the cover enables access to components in the electrical device electrically connected to the high voltage interlock circuit, a jumper coupled to the main body and configured to extend through a receiving aperture in the cover to couple to the connector and establish circuit continuity when the main body is coupled to the cover, and a flange extending from the main body. When the main body is coupled to the cover, the flange covers and prevents access to a fastener that couples the cover to a housing of the electrical device such that the main body must be uncoupled and removed from the cover in order to remove the fastener and enable removal of the cover.