Using this red illuminated toggle switch is easy. First, decide on your wiring option based on what you want the switch to do. If you want to turn something on or off, use the toggle to connect and disconnect the two pins on the bottom. To keep the LED always on, provide 3 - 12V between the ground and headlamp pin. For the LED to be on only when the switch is connected, provide 3 - 12V on the (+) pin and connect ground to the ground pin. Remember, although it says '20 A' on the side, we recommend using a maximum of 1 - 2A to ensure the switch's longevity. The protective cover is a nice addition as it can automatically turn the switch off when flipped closed. If you don't need it, simply remove it. Also, this switch doesn't come with spade connectors, so you'll need to get your own if you need them. As for maintenance, keep it clean and dry. Avoid exposing it to extreme temperatures or moisture, which could damage the LED or the switch mechanism.