Does the meter work differently when testing a known good system?
Your cheap digital multimeter may be the reason you are seeing the voltage jump all over. The regulator also works digitally so the current applied to the rotor field coil is either maximum or nothing. The output voltage is determined by the amount of time voltage is applied through the bushes verses the amount of time there is no voltage applied. As a result the output voltage from the alternator is also varying constantly. The regulator switched so rapidly that an analog voltmeter cannot react fast enough to show the change in voltage from the alternator output. Your digital meter continually takes a "snapshot" of the voltage and shows it on the display. The capacitor in the alternator is supposed to smooth out the voltage spikes but even with a good capacitor you are able to see the wave pattern in the output voltage when it is displayed on an oscilloscope.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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