Just bought a pontoon off a neighbor, and appears to be about 1974. Motor is a 1974 50HP Johnson. Got it home, parked in the driveway, and when I hooked up the wires to the battery, it through a spark at the connectors. All lights and accessories have been disconnected and stripped from the boat -- the only thing that is still connected is the motor. Started up just fine for a few seconds, but the wires still spark when I hook the battery up. Yes... I know... the positive and negative is in the right place. Left it connected overnight, and ran the battery completely down -- when I tried to charge the battery, my solid state charger kicked out a F01 error -- bad cell, replace battery. Anyone have any suggestions as to how I should proceed with troubleshooting this problem, and what exactly would be a logical progression through this troubleshooting? Any advise would be greatly appreciated.