Ghosts? My '87 Convertable Heater/AC Blower Starts Mysteriously

I'm stumped. While parked in my garage with everything turned off...the blower motor sometimes just starts to run and continues until the battery is dead. Temporarily, I have installed a battery terminal disconnect to protect against this. I sure need some suggestions on a trouble shooting, fault isolation approach to resolve the electrical fault and rid my ride of electron ghosts.
Thanks
Chiz Chisholm
Easton, MD
pa22plane@yahoo.com  

That's strange. Wonder if the blower motor relay is gone bad, but with the key off there shouldn't be any power going to that relay.

Using logic, I think you might have a problem int he ignition switch, it's not cutting power off to the car.  

Thanks! I'll start the troubleshooting at the ignition switch and see where that leads.
Chiz