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Table 4: Diode Decisions and Recommendations
Decision Action
EXCESSIVE RIPPLE One or more diodes in the alternator aren’t functioning or there’s stator
damage, which is shown by an excessive amount of AC ripple current supplied
to the battery.
√ Make sure the alternator mounting is sturdy and that the belts are in
good shape and functioning properly. If the mounting and belts are
good, replace the alternator.
OPEN PHASE The Tester has detected an open phase within the alternator. Replace the
alternator.
OPEN DIODE The Tester has detected a open diode within the alternator. Replace the
alternator.
SHORTED DIODE The Tester has detected an shorted diode within the alternator. Replace the
alternator.
Chapter 6: System Test
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