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Generator Symptom Diagnosis: Noise

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
NOISY GENERATOR REFERENCE CHART

Condition Possible Cause Action
Noisy generator  Mounting bolts loose Tighten mounting bolts  .
Bearings dirty, worn or faulty Repair or replace generator  . See Generator Disassembly and Reassembly 
Rotor, diode or stator faulty Repair or replace generator  . See Generator Disassembly and Reassembly 
One way clutch pulley faulty Repair one way clutch pulley  . See Generator Disassembly and Reassembly