The current invention is a Hitch Switch trailer accessory (switch adapter cap). It is a trailer/camper electrical connection adapter/cap with luminescent features that can be used to switch/power on and off the marker lights on the trailer/camper. The switch adapter cap attaches to electrical pin or blade connectors on standard trailers and campers. It fits over the male connector attached to the trailer/camper. The switch adapter cap has internal components that make connection with the pins or blades on the trailer/camper connector. The switch adapter cap has a novel light-up feature (either around the switch or the switch itself) that enables the switch adapter cap to be visible in low-light settings. The cap will have a wireless communication means that can connect to a computer application on a computing device.