C 230 CL (203.740) L4-1.8L SC (271.948) (2003)
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Rectifier Diode / Bridge: Testing and Inspection
AR15.40-P-930102P Test diodes of alternator
Commercially available tools
Connection diagram
1
Connect the engine tester with oscilloscope (030).
2
Start engine.
3
Switch on low beam.
It is not possible in this test to assess the exciter diodes.
4
Assess diode harmonics at 3000 rpm (engine speed).
Voltage peaks are possible but without meaning
Harmonics of the diodes is OK (example)
Voltage peaks are possible but without meaning.
