IF it was infact the thermostat that failed, this what happened:
The thermostat has a sensor located on it for the 'map' control. The sensor will leak coolant past the housing and into the engine harness connector. Usually when this happens you will see dried coolant around the connection. Most times when it contaminates the harness it blows the fuse in the relay pack located in the E-box. If you replace this fuse without fixing the thermostat THEN they usually catch fire, most of the time they don't burn the first go around.
Sorry for your luck, but that is what happened and unfortunately it didn't pop the fuse.