I just changed the alternator in my 2000 Nissan Altima GXE and afterward the only electrical things that are working are the headlights, and radio. It starts fine but I have to feather the gas when its cold but just for a few seconds then it runs just fine. While I was disconnecting the old alternator I got a spark from the connector screw. So I figured a blown fuse but I checked them and they all seem fine. Even the ones located by battery. Any ideas?