C 280 (203.054) V6-3.0L (272.940) (2006)
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Rectifier Diode / Bridge: Testing and Inspection
AR15.40-P-9301-02V Test alternator diodes
Connection scheme
In this test it is not possible to assess the exciter diodes.
1
Connect engine tester with oscilloscope (030).
2
Start engine.
3
Switch on low beams.
4
Assess diode harmonics at 3000 rpm (engine speed).
Example: Diode harmonics in order (voltage spikes possible, but not significant)
Example: Diode harmonics in order (voltage spikes possible, but not significant)
