Thanks for your replies and I should of mentioned that my van is a 2007 Lunar Lexon EW Twin Axle. I do have a mover which was fitted a couple of years ago and I can see the fuse for this which is screwed down inside a small black box , so no problem there and the mover is wired straight into battery so still operates, I have a feeling that i will find the fuse under the battery box but it does seems strange that any right minded company would do this but perhaps Lunar are the exception. I am pretty sure its not in battery box as I have a good idea of where everything is except this fuse. Frankly I never use the van on a site without 230v and so I guess it will work OK but not sure if running like this is detrimental to other parts of the system. Bearing in mind last year when I was away the charger blew up and everything failed . Bought new battery and fitted an external charger under seat into the battery box and charged it up that way.