If you going to use a rocker switch to send power to USB. You need a 5 pin rocker switch. 5 pin rocker switch has independent pins for illumination. Bottom led and top led are independent. For example, my rocker switches illuminate only when I turn on my head lights. And then the top part of the rocker switch illuminates when you flip the switch. Just my preference. I wouldn't want a rocker switch always illuminated.