Gents, today I allmost lost the alternator nut while driving. After removing the alternator cover it appears to be hanging on to the washer behind it.. I'll try to discribe the 'symptoms': at first the battery lamp stayed on for a long time. I think it took about 15 minutes before it turned off. Furthermore I feld a vibration through the bike and after a while it got worse. After half an hour I got off the highway and had to stop at a traffic light. It didn't run smooth when idling. Allmost like it run on one cylinder. On the other hand it didn't stall when running stationary. In the end these symptoms can be explained cause the rotor wasn't fastened and had some freeplay.. Hope this helps fellow paso-brothers in the future to avoid damage..
and make sure the washers are in place as they tend to fall down with even small taps