Alternator: Testing and Inspection

WAVEFORM CHECK USING AN ANALYZER





MEASUREMENT METHOD
Connect the analyzer special patterns pick-up to the generator B terminal.

Standard Waveform:

NOTE: The voltage waveform of the generator B terminal can undulate as shown. This waveform is produced when the regulator operates according to fluctuations in the generator load (current), and is normal for the generator.

In addition, if the ripples are abnormally high (more than approximately 2 V when the engine is idling), the cause is probably an open circuit between the generator B terminal and the battery due to a blown fuse, and the generator itself is usually okay.




ABNORMAL WAVEFORMS EXAMPLES