Abstract: A holder for an electrical connection component to be mounted upon a towing vehicle. The holder includes a retainer for fixedly receiving the electrical connection component and exposing electrical contacts thereof through a closable aperture of the holder. During use, a closure or door is held open by a plug from the trailer's electrical lighting system, but is allowed to securely close when the plug is not installed. A baffle type friction path is provided within the holder for securing lead wires of the electrical connection component so as to prevent undue tension at the more fragile connection between those lead wires and the electrical connection component. When completely assembled, the holder provides a moisture and particulate barrier between the electrical connection component contained therein and the outside environment.