I use this to control the navigation lights and bilge pump on the Boston Whaler whaling ship. I didn't want the LED to be on all the time, so I experimented a bit. Attached is what I believe to be the internal wiring. Disconnecting the red wire from terminal #4 removes power from the "Off" LED, therefore it will not illuminate and will drain the battery. Note that if you squeeze the built-in clip with needle-nosed pliers, the female shoulder blades will easily come loose.
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