I am new to the principal of 13 pin plugs on the new caravans. I have just purchased a Sterling Eccles 442 Sport . My older van had 2 7 pin plugs, but I only used the black one while traveling, because my vehicle only had 1 plug. I have upgraded my vehicle to a 13 pin plug to accommodate the new van, but the sales person did not explain the charging procedure whilst in transit. As I have a motor mover on the new van, I require a fully charged battery when I reach site to use it. Does the unit charge the battery automatically when connected to vehicle or do I have to "switch something on" inside van so that the charger "kicks" in .?