A little off topic mechanical help is needed. I have a mid 1970s Toro/Wheel Horse riding lawn tractor. I started it the other day and everything was normal but when I turned the ignition to the off position the engine stopped running but there was a really loud hum coming from the starter. I had to disconnect the battery to make it stop. I haven't reconnected the battery since for fear of blowing some electrical parts. Any advice from the mechanical gurus here would be greatly appreciated. If anyone can recommend what to repair or replace I'm sure Bill can provide a link to parts diagrams and numbers for every tractor ever made.
Thanks in advance.
Skye