Originally Posted by BarryD0706
see posts #6 & 7. There is something wrong with your 30->50 adapter.
Barry, you were right. While checking the power cord and adapter I discovered that there was a disconnect between the 30A male and one of the hot wires on the 50 Amp power cord. Somehow, one pin of the male 50 amp connector got slightly bent, and was not making contact with the corresponding pin in the 30 - 50 amp adapter. I straightened the pin, re-plugged everything and all the connectivity checks passed. Plugged in the coach and the power works as expected.
Thanks for all your help.