A connector assembly includes an electrical connector and a shipping cap. The electrical connector includes a housing and a lever pivotably coupled to the housing. The lever is pivotable relative to the housing between an open position and a closed position. The lever has a guideway configured to receive a guide journal of a mating connector that mates to the electrical connector. The shipping cap is removably mounted to a mating end of the housing when the electrical connector is not mated to the mating connector. The shipping cap includes a lid that covers a mating opening of the housing. The shipping cap further includes a blocking tab that is received in the guideway of the lever when the lever is in the open position. The blocking tab in the guideway engages the lever to block the lever from pivoting to the closed position.