I have a 2000 7.3 PSD and this morning I started it and it cranked fine then about an hour later I went to start it then it cranked once and ALL electronics died radio, lights, everything. So I mess around connecting and disconnecting the batteries then the interior lights came back on and I went to start it and it was almost like it was trying to start on one battery. The driver side battery is a week old and the passenger side one is old but still VERY good. Could it be the cables maybe? Bad ground? Any and all ideas are appreciated!!!