First question. Why do my 12 volt lights get brighter when I plug into shore power? Next question is if I tap into my 12 volt reading light in the bedroom can I use those wires to run a pig tail to in...
Your lights get brighter when you plug into shore power because that turns on your converter/charger. Whether you can power your cpap machine depends on the wire size, the fuse size protecting that wire and the amperage of your machine.