I have a 1998 Izuzu NPR that is completely dead. It hasn't been used since last fall but we moved it a few times in the winter and it was fine. So, I went to start it a few days ago and it was dead so I put the batteries on a charger. The batteries were old and did not take a charge so I replaced them. Now, the dump bed works but everything else is dead. Not a single thing will turn on in the cab. I looked at how the batteries are hooked up about 10 times just to make sure and everything looks correct. Any ideas would be helpful.