If your set up is the same as my Palazzo the trombetta solenoid has probably failed. There is a previous string on this forum.
https://www.thorforums.com/forums/f8...ent-19308.html
You should start your engine and then check for 12v going to the solenoid/relay from the nearby controlling circuit board. There is a 2-3 minute delay after the engine starts before a signal is sent to the relay to close so that the engine charging system and house battery system are connected together. If 12v gets to the relay, check the relay's ground connection also. If all that works and you do not see 13.5 volts on the house side of the relay, you have another defective relay.
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