Abstract: A cover is provided for closing a cavity and a polarizing slot of an electrical connector to protect interior terminals during a soldering process with the electrical connector mounted on a printed circuit board. The connector is in the form of a header having side walls and a bottom wall defining the cavity. A polarizing slot is formed in one of the side walls. The terminals are disposed in the cavity, with solder tails projecting through the bottom wall for soldering to circuit traces on the printed circuit board. The cover includes a lid press-fit onto the header to close the cavity, and a projection depends from the lid in position for closing the polarizing slot in the one side wall of the header.