No, there is no documentation on the various accessory programs on Rings site in the sense of what each of them does and how to use them. There is documentation on what Accessory programs are, what they can do, how to use them and how to write them in the RailPro Assistant manual starting on page 39. That's obviously not the best situation though.
So, by looking at the program for the turntable project (you can find out how to do that in the RPA manual) we can see that the output being used by the program is Motor1. Looking at the manual for the AM-1S tells us that Motor1 is outputs 1 and 2 on the AM-1.
Looking at the Turntable relay project it's just for triggering a couple of relays to drive the turntable motor instead of driving it directly with the AM outputs; one could use a higher powered motor than what the AM could handle by itself that way.
As for the short you got, can't explain that one but I doubt you should be able to have more than one accessory project loaded into the AM at the same time (how would it know which project to use otherwise) so if you have managed that then that's probably the problem. Don't know if you can delete projects from the AM using the Delete files button.
- Tim