AR15.40-P-9301-02EW Test Alternator Diodes

AR15.40-P-9301-02EW Test Alternator Diodes





Connection scheme

030 Engine tester with oscilloscope
065 DC clip-on probe

F32 Front prefuse box (only model 212)
G1 On-board electrical system battery

G2 Alternator
M1 Starter
W10 Right front battery ground point

1 Connect engine tester with oscilloscope (030).
2 Start engine.
3 Switch on low beams.

In this test it is not possible to assess the exciter diodes.

4 Assess diode harmonics at 3000 rpm (engine speed).





Harmonics of the diodes is OK (example)

Voltage peaks are possible but without meaning.





Harmonics when a positive diode is faulty (example).





Harmonics when a negative diode is faulty (example).