Hello, In the appendix a picture of my 7 pole jack to my Ford pickup. I think this is not standard in Germany. Minus is mass and + comes only voltage with switched on ignition. Suppose I don’t want to charge the consumer batteries of the WW over the Lima: Does mass from the 7 pole plug have to be connected somewhere? Does this bring an advantage? Safety? Suppose I want to charge the consumer batteries of the WW over the Lima. How do I connect + and mass then? It is also equipped with a solar controller and solar panels. Consumer batteries are connected in parallel and each of one battery goes + and – to the solar controller. From the solar controller a + cable goes to a distributor with fuses for the consumers. On the cable both the distribution box and all consumers are connected. Refrigerator runs exclusively on gas. Does not support 12v Thanks already