Abstract: A trailer lamp testing and lamp storage apparatus is provided for connecting to an electrical connector of a trailer, wherein the electrical connector of the trailer has a predetermined number of contacts for a predetermined number of lamp circuits in the trailer. The lamp testing and storage apparatus includes a housing assembly which includes a bottom housing portion, a hinge assembly connected to the bottom housing portion, and a lid assembly connected to the hinge assembly. A storage assembly, supported by the housing assembly, is provided for storing a number of replacement lamps for replacing burned out lamps in the trailer. The lamp testing and storage apparatus also includes a predetermined number of battery-powered testing circuits and a connector assembly for receiving respective ends of the predetermined number of testing circuits.