Hi we have just moved our caravan and plugged back in but have no electric. The fridge is working and the lights are dim which is I’m assuming the 12v from the battery. We have checked the fuse in the hook up and when we test the rcd in switches off. Am I right in thinking that there is power to the rcd and that any problem is in the caravan? Also if I switch up the rcd it will stay on so why do we still not have any electrics? Any suggestions? Many thanks