of the electrical circuitry to ground the lamp the bulb support bracket 53 is carried on a bulb slide 55 which is insertable into and removable from the housing 10 through the opening in the bottom of the lamp housing 10 the bulb slide 55 is positioned by the channel 15 formed in the rear wall 14 of the housing 10 so that the bulb 51 will be in optical alignment with the lens 5 brackets 57 are carried by the bulb slide 55 to support a dust window or splash guard 59 which functions to prevent dirt from passing above the guard 59 but allows the free flow of air for a more detailed description of the operation of the lamp assembly during submersion in a liquid reference is made to dennis g moore u s pat no 3 858 939 34 lamp assembly 34 the disclosure of which is incorporated herein by reference turning to fig2 a pair of lead wires 19a and 19b are connected to the bulb socket 52 of the electric lamp assembly 50 in order to provide power to illuminate the bulb 51 the lead wires 19a and 19b must be connected respectively to another pair of lead wires 20a and 20b which are coupled to an electrical system of a trailer or vehicle upon which the lamp.