My 1967 110 (S/N ~70,000, 8 hp Kohler) suddenly stopped running and won't restart. It was running fine, plowing snow, when it suddenly quit. Right after it quit, I pulled the hood open and saw a bit of smoke coming up between the gas tank and battery. Afterwards, the GEN light would not come on and it won't turn over. After doing some checking, I noticed one of the wire connections to the starter/alternator was very loose, but after tightening that and the checking other connections, the GEN light does not come on and it won't turn over. I hoped to find something burnt, but didn't find anything. Any ideas on what the smoke might be from or what to check? I know the voltage regulator, solenoid, and switch are under the battery, but all the connections look ok.