C 240 Wagon (203.261) V6-2.6L (112.912) (2003)
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.