Rectifier Diode / Bridge: Testing and Inspection

AR15.40-P-9301-02SX Test alternator diodes

Connection diagram shown for model 230:

1 Connect up engine tester (030) with current clamp (065) according to connection diagram
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)

Example: Zero line, if the alternator fuse is defective:

Example: Zero line, if the alternator fuse is defective.

Example: Harmonics, if a positive diode is defective:

Example: Harmonics, if a positive diode is defective.

Example: Harmonics, if a minus diode is defective:

Example: Harmonics, if a minus diode is defective.