I have 2008 Fleetwood discovery with 350 hp cummings freightliner chassie. I turned on key and let it go through engine check and then cranked engine . I noticed that all electrical gauges , voltage fuel ect. were not working . turned off and back on nothing. took to mechanic and he came up with batteries were not strong enough and replaced . cleared up problem for about 6 months and now I cranked up yesterday for trip this weekend and not working again. also forgot to mention the turbo does not kick in either when this happens . anyone ever have something like this happen. would appreciate any help.