Sounds like a large solenoid but if you aren't plugged into SP, generator is not running and engine is not running then nothing should be trying to activate. Do you have an Emergency Start switch? does it make the same noise when you press that switch?
I'd be on the phone to Thor customer service this afternoon if that was my RV.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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