I'm in the midst of building my control panel. I have some illuminated LED rocker switches but can't figure out how to wire them. There are 4 pins on the bottom. Pin 1, 2, 3-, 3+. I get that pin 1 and 2 are for the actual switch and pin 3-/+ is for the LED, but I have no idea how to wire it! Can anyone shed some light on this?