I'm looking at a used boat and I dont know much about the motors, went to look at a 92 Stratos 18’ with a 1999 150 fast strike, of course the guy said it ran perfect last time he had it out in April, lol the boat cover was ripped and laying off the boat and the battery area and a couple inch's of water in it [ its been raining a lot in my neck of the woods] because of the angle he had the boat. we tried to start the boat so I could hear it run before I did a compression check and the 2 inch long black wire on the starter solenoid got hot and melted the plastic coating off and the neg cable on the battery got hot, after a couple minutes the battery ran down so we couldnt start it and I did not do a compression check . what would cause this? TKS.