How to Wire an Illuminated Rocker Switch Aug 17, 2015An illuminated rocker switch is like a SPST toggle switch with an extra terminal which allows the light to work. You might want to review the article on toggle switch wiring before proceeding. Also relays can be used to switch higher draw accessories to reduce switch load and voltage drop.Author: WD Tech Illuminated Rocker Switches - WiringProducts. Ltd. Illuminated Rocker Switches have a built in light to provide indication of your circuit operation. All of our illuminated rocker switches are designed to operate at 12 volts DC, expect for the illuminated appliance rocker switches, which operate at 120 volts AC.