I've got an issue where by if I go over a fairly severe bump in the road, the camper 12v system completely drops out! I've checked the master on/off switch by the door and that's OK, also checked the battery connections; OK. It has happened twice and has come back on after driving for a while. Any ideas? The only thing I can think of is the relais operated by the master switch. I haven't been able to find that yet; is it part of the fuse box under the rear seat? Any help greatly appreciated!