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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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