Need help on how to install a 12vdc switch for new water heater. I installed a new Atwood water heater and notice that the electric is different from the old water heater. Old water heater has Blue, White and Brown wires, new water heater has Blue, White, Red and green wires. Talked to Atwood tech and she said if I wanted to run my water heater on electric mode only I would have to install a 12vdc switch. I am half way decent with 110 volt but ignorant of 12 volt
system. How do I wire this up? How do I get 12volt power? Any help wood be appreciated.