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10.3.11. Alternator Field VR
Measures and compares the pulse width modulated field control signal used by the alternator to
regulate the output.
Path:
ALT FIELD VR
BLACK TO ENGINE
(CHASSIS)
RED TO FIELD TEST POINT
10.3.12. Alternator Diode
Measure and compares alternator diode waveforms
Alternator diode allows current to pass in one direction.
Path:
ALT DIODE
BLACK TO BATTERY – (NEG)
RED TO BATTERY +(POS)
Normal Alt F/VR waveform
Normal Alt Diode waveform
10-26
Alt Field VR
Measures PWM field control
signal to regulate its output.
Alt Field VR
If the diodes are defective, it
produces high AC voltage.
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