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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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