Thanks for the suggestion for a simple fix. I had not considered bypassing the gizmo but that would certainly work. I guess the only time you might want to have the house power switch function is if you had to leave the coach somewhere in storage or for service, and wanted to shut down house power. I keep mine plugged into a 50amp service so that is not an issue for me.
I do have a big 400amp fuse in the bay. However, since the left side of the solenoid is hot (according to the wiring schematic that feed comes from an 'inverter fuse'), I figured the fuses were all OK. The right side of the solenoid (labelled 'To 120 amo breaker for house power') is not hot, it must either be the solenoid or it is not getting a signal to energize from the switch at the entry door.
Thanks to you both for the help.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA