I have a 96 powerstroke and as time has passed over the last couple months it acts as if the batteries are going dead, but they are fully charged. Yesterday I drove it across town and when I tried to start it, it acted like it needed to be jump off but it cranked with a little raddle, made it home and tried to crank it but it barely turned over, put a set of jumper cables on it to see if it would start but barely turns over and well not start. Could this be a starter problem or internal issues. Please help if possible, thank you.

If you have removed and fully charged each battery, the stater motor is likely failing.