Truck went dead for customer, nothing works. no display on bdi, sent steinbock controller for repair, refitted, steering and hydraulics now work although power steering permanently on. No traction and the bdi doesnt work, checked supplys to bdi, all correct.have noticed i have 60v at the two traction terminals of the controller?? truck is 48v, sent controller back to repairers but they have tested it and say on the bench, everything works,including the bdi. Any ideas.