[66sprint6]

Last night I was sitting in my newly acquired '67 Lemans, just going through the car and trying various lights, etc. When I turned the ignition on, the switch started to smoke. I turned it off and tried to look underneath, but I can't see anything because of all the air conditionng ductwork. It was dark so I just disconnected the battery and hopefully I can get a better look in the next couple of days. I'm trying to think of what would cause something like that. Maybe some creative wiring under the dash from a previous owner?. I've been checking online and have found this switch to be quite rare indeed. The ignition switch for an A/C car has 7 terminals, instead of six for a non-A/C car. It also has the provision for the ignition lamp. Is there a source for these? Can I use one from another model or year? Any suggestions as to why the switch would start smoking?