hi, our van recently decided that the fridge wouldn't work on 12v, the van went for a service and the dealership said the fridge was working ok as they had tested it. There was a fuse in the car that kept going and then being replaced but that didn't do the trick. I took it to a car electrics place locally and they said the circuit was being overloaded. it then came to mind that the caravan dealership had said our van's battery was faulty. Then the lightbulb came on and I asked the electrics people if the faulty battery was to blame and they said yes, as the current would bypass the faulty battery and go to the car, then blow the fuse. We got a new battery for the van and hey presto it worked. Hope this might be of use to you.