What he said!
There are reverse polarity fuses in case this ever does happen. They are either located in the 12V Fuse Panel or they are on the Converter itself. Depends on the type of Converter you have in your coach.
Go to the Thor Owner Resource website and you can pull up the documentation and schematics for your coach.
https://www.thormotorcoach.com/owner-resource/
Thor Forums
