I have a 2003 Fleetwood terra. Today I turned on the generator while the shore power was still being used. The power from the generator was not being used even though it was running. I then noticed the shore power was tripped. I have never had this happen before. Now every time I try to use the shore power the shore power circuit trips. There seems be a short somewhere in the system. Any ideas? BTW the power from the generator still powers the motor home.