I have a 2004 f350 with 6.0 power stroke. It has been sitting about 3 weeks and the weather has been sub zero at night. I tried to start it and the battery was drained. I hooked up my charger. When I tried to start it, it turned over but no start. I took the key out but the starter still was engaged. I had to disconnect both batteries. Now, when I put the battery cables on, the starter tries to start the truck. The key is in my pocket. Any help?