Onan Quiet Diesel not cranking?????Error 46

Ok, so I recently just purchased a 2000 dutchstar motorhome with a 7500 quiet diesel gen set w/ 1600 hours on it.. When I go to start my gen. I get a blinking code of 3 blinks.. When I then push the stop button I get---4 blinks and then 6 blinks.. OK,so we have code #46 so that indicates low voltage.. I preceede to check all connections, voltage and all that good stuff, everything checks out OK, check all fuses related. All this to discover no change whatsoever. WHY??? I'm thinking I might have a bad board for the generator!!! Is this possible? Has anyone have any experience with code 46? If so could you please give me some advise? I don't know where to go from here, now where do I look to? Starter connection?? I don't know.. Called Onan and all they said is it sounds like you have a bad connections somewhere or low voltage...Well, I could have told you that, Onan tech support is crap..Waste of time even giving them a call. Any help would be appreciated..