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...
My charging voltage, whether from the inverter/charger, or my alternator is about 14.4 volts. When the batteries are not being charged, they are a little over 12 volts. When you plug in to shore power, and your batteries are discharged to the point where they need a charge, the voltage will increase, which makes your lights brighter.