hi i have a compass corona 626 club with a 13 pin plug my tow car has the 7n and 7s plugs i bought an adaptor to fit and it seemed to work ok. i have found a proble that whie i am towing the fridge does not charge, on reading a few web sites it says that pin 10 on the new plug charges the battery or the fridge does anyone know how i can make this charge the fridge only or can i make it charge both all advice would be greatfully accepted cheers