I'm having the same problem on my 2008 FW Hurricane 34B.
I ran my house batteries so low I ended up replacing the aged batteries. No house power. I start the Gen and about 15 seconds later the house power kicks on.
I called Thor and the service tech told me to look hard under the master bed. In some other wires is a red 6 gauge going to a two terminal little grey box. The copper wire terminal will have a reset button. The silver terminal will not. The problem is, I still can't find any of this he described.
I'm hoping the original poster took a pic of what he found to post up for me.
I'm headed to the rv first thing to look again. We've got a trip to Blaine Friday for a few days. We'll be in Vancouver most of the time.