Dear Mary, If you have blown a fuse on your device in your camper, then the fuse should be the first port of call. if this don't work, try the connector where it is possible to replace the cable that allows the conversion of electricity. It might be wise to talk to fellow caravanners ;or caravan sales shops regarding RCD's for such devices.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix camping equipment.