Abstract: A light mount assembly for coupling with a light fixture for attachment to the guide posts of a boat trailer. This invention focuses on an improved assembly for attaching light fixtures to the guide posts of boat trailers without reconfiguring the lighting system or the guide posts. The light mount assembly serves as a universal adapter for attaching brake or turning signal lights to the elevated position on the guide posts of a boat trailer. The assembly with its contiguous components provides a protective covering for the electrical wires of the light fixture and the coupled apparatus is easily attached to the guide posts using an adhesive, welding or screws as a fastening means. The light mount assembly requires little or no maintenance, is made from noncorrosive and durable material, and allows for the easy replacement of the light fixture without removal of the assembly form the guide posts.