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Connect the oscilloscope special
patterns pick-up to the alternator "B" terminal.
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| note |
The voltage waveform of the
alternator "B" terminal can undulate as shown in
the illustration. This waveform is produced when
the regulator operates according to fluctuations
in the alternator load (current), and is normal
for the alternator. In addition, when the
voltage waveform reaches an excessively high
value (approximately 2 V or higher at idle), it
often indicates an open circuit due to a brown
fuse between alternator "B" terminal and
battery, but not a defective
alternator.
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