We recently lost all 12volt power in our van after hitting some bad roads into Griffith NSW - all the fuses where ok checked with a trouble probe lamp and found no power was coming to fuse board . Had me foxed , called into Jayco Griffith, the guys pulled out the fuse board and found a wire had vibrated off the back of fuse connections ,easy fix - Phew . This post is for the info of anyone who may have the same problem some time from rough roads and also a good rap for the boys at jayco griffith .