Did you check the main breakers on the generator? Also, there's a fuse in the panel with the main breakers on the generator. Also, the main control board in the generator can get damaged. There's better sources than Cummins for that board. Don't have that info with me right now. I'll get it for you if you need it.
2016 Creekside 23RKS
2012 Ram 2500 Laramie 4X4 Cummins 6.7L