Example Of Abnormal Waveforms

NOTE:

The size of the waveform patterns differs largely, depending on the adjustment of the variable knob on the oscilloscope.
Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). (Waveforms can be observed when the headlights are illuminated.)
Check the conditions of the charging warning light (illuminated/not illuminated). Also, check the charging system totally.

Abnormal waveform	Problem cause
Example 1 Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.	Open diode
Example 2 Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.	Short in diode
Example 3 Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.	Broken wire in stator coil
Example 4 Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.	Short in stator coil