No start after fuel filter/electrical issues.
Hey everyone, I just bought a 96 PSD about a week ago and it started and ran great every time no matter what the temperature. I decided to change the fuel filter because I didn't know when it was done before. I put the new filter in and tried to start it. It wouldn't start, so I searched for a long time on here and saw that you have to bleed the fuel system so I opened the valve and cranked until fuel came out steadily. Then I charged up my batteries and put a heater on in the garage with the truck. It fired right up and I let it run for about 45 minutes. I shut it off and started it right back up with no problems. This morning I went to start it and it wouldn't start again so I took the batteries up to have them tested and they tested fine. Then when I put the batteries back in I messed up and put the battery on the passenger side in backwards. It sparked badly and melted the terminal. I got a new battery and put it in. Now when you hook up the positive terminals on the batteries the alternator starts smoking pretty badly.
Any ideas on why it wont start after it ran for 45 minutes last night?
Also what have I done by putting the battery in backwards?