I hope I’m right here. I usually drive around the Meriva A Forum and the Käfer Forum. I need someone with a clue. Problem: I have a 30-year-old caravan. It has a 12V starter battery. So that you have light on the way. (The caravan has only a 7 pole connection and therefore no vehicle current from the towing vehicle) Now I bought a small fridge and a voltage converter. I tested this – works Now I would like to charge the battery in the caravan while driving and just operate the fridge. Car has 13 pin incl. continuous current from the battery. So I could convert the caravan to 13 pin and then have 12V in the trailer. Just how do I keep jamming? The voltage converter has pole terminals as a connection. I have no idea about this.