Hello, I've been fiddling with the electrical lately, mainly dashboard stuff, removed all cables related to the radio and rev counter, things are getting a lot clearer. Now that I'm pretty familiar with the front, I moving backward, and stopped on the Westfalia control panel which has been completely cut off from the main circuit, the fridge does not work, neither does the interior light for now (checked bulbs obviously). I dismantled the battery level gauge which was full of rust, and found out that the pointer was out of its axis. Careful cleaning, and a little welding here and there got everything back into place, I tested the thing on 5v and 12v, and I was happy to see the pointer moving backward and from red to green. I now need to understand how everything was actually cabled out. I believe that it is supposed to be connected like this: black: ground white: stationary battery + red: city current + blue: fridge + Stop me if I'm wrong before I fry up everything. Enjoy your evening.