Repair completed and opinion
I completed a temporary repair using crimp butt splices until I can go with a terminal strip or block as suggested by scrubjaysnest.
After I made the repair, I looked at the open junction box with the generator running and I noticed a steady vibration of the box and wires inside, certainly caused by its close proximity to the generator mount. As suggested on this site, the vibration appears to have caused the two black wires to vibrate loose and burn through the wire nut.
Shame on Thor Motorcoach for placing their bottom line before their customer's safety. The cost difference between wire nuts and a better connection method is mere pennies. This is probably the final straw in a long list of issues I've had with this coach that will make sure that my next motorhome is not a Thor product.
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