An electrical junction box has a connector retainer assembly with a first contact surface, as well as a connector housing assembly with a pivotal lever arm. The lever arm has a first engagement surface. The connector retainer assembly and the connector housing assembly configured so that when the lever arm is moved in a single direction relative to the connector housing assembly, the first engagement surface engages the first contact surface and the connector housing assembly moves relative to the connector retainer assembly from a pre-staged position to an assembled position.