That looks like a latching relay and the fact that it does not show on the Thor information you received is interesting. At least now you know where it is located and if you test its operation/function there is a good chance that it is your problem. Too bad it is such a hard to reach location, but that seems par for the course for many of us depending on the system and coach. I am attaching an ebay.com link to a 100 Amp Intellitec latching relay but if you find your relay is bad I would suggest trying to find the same one to replace it with which sometimes just makes replacement easier....mods required. Also note that the relay tower should be mounted in the same vertical orientation. Good luck.
https://www.ebay.com/itm/Intellitec-...frcectupt=true
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