How you wire a 3-prong rocker switch depends on whether it is illuminated with an LED or neon bulb, or whether it is an SPST (single-pole, single-throw) or an SPDT (single-pole, double-throw) switch. If you don’t know what kind of switch it is, a meter that tests resistance can tell you. It can also help you determine which prong goes to the switch bulb ground and which prong switches the device you are turning on or off. On all rockers, the center prong attaches to the power source. Writer Bio
