Thanks for all the helpful info, especially the mechanical "principles" at work in these engines.
to review some general principles: 1) idle speed and alternator voltage are normally independant of each other;
2) both should remain relatively constant, aside from load factors.
3) an abberation in one should not affect the other, unless its causing a system-wide shutdown.
hence, I have a question: what is being measured when you attach a voltometer to the battery? is it the gross volatage simnply being produced by the alternator, or is it the net voltage subtracting load? wihat is the effect of increasing the rpm's on the volatge? if you run the rpms to 6000, does it not increase the voltage?