It seems to me that the alternator is communicating, at least that is the way it appears in this video;
https://photos.app.goo.gl/Dz5empcYjqEHCmXt9
Although it only gets to 14.1 volts, and I did start it once before making the video, the voltage does raise gradually.
Also, I tried to scan codes again, and I could not even access most of the modules without getting a communication error. However, I was able to access the diagnostic section, and got a 930C and 930E.