I have a T6 semi converted. I have two 12v 6amp points at the rear of the passenger seats base. They both work fine. I have two corresponding 3 point plug sockets on the base of the drivers seat - they however do not seem to be working. I’m new to the camper scene - will the plugs only work if the van is hooked up or should they work without being at an electric hook up?? Cheers