2006 mazda 6 has starting issues. battery is new, alternator checked and starter checked, all good. cannot jump start car with battery terminals attached. if one terminal on battery is removed, or both and a jump pack is attached to the battery leads, car will start. also if battery terminals are removed and jumper cables attached to battery and disconnected terminals, car starts. terminals on battery has been replaced. ground wires from battery to body and transmission have been replaced as well. what is the issue?? is it relays or what? I have checked everything as far as grounds and have made sure a good connection is being made.