An electrical connector assembly for an automotive subassembly having an enclosure is described. The electrical connector assembly includes a female electrical connector mounted to the enclosure and having a tight space between a wall of the female electrical connector and an adjacent inside surface of the enclosure. A male electrical connector has a spring-action lock that locks the male electrical connector by way of a single locking tab that pops out to project through a slot in the wall of the female electrical connector when the male electrical connector is fully inserted into the female electrical connector. A color of the wall of the female electrical connector is a dark color and a color of the locking tab is a bright color such that a secure connection between the male electrical connector and the female electrical connector is indicated by appearance of the projected locking tab within the tight space.