6D3–10 STARTING AND CHARGING
Troubleshooting
Condition Possible Cause Correction
No output Bad terminal connection Repair
Open or shorted circuit Repair
Open field coil Replace
Defective diode Replace
Defective IC regulator Replace
Low output Loose terminal connection Tighten
Loose cooling fan belt Adjust belt tension
Defective diode Replace
Shorted field coil Replace
Shorted stator coil Replace
Defective regulator Replace
Defective battery Replace
Poor terminal contact Repair
Overcharging Defective regulator Replace
Defective battery Replace
Unstable current Poor terminal contact Repair
Loose cooling fan belt Adjust belt tension
Short field coil Replace
Shorted stator coil Replace
Intermittent contact in wiring Replace
Poor terminal contact Repair
Defective regulator Replace
Abnormal noise Improper alternator installation Correct
Defective bearing Replace
Contact between the rotor core and Replace the rotor core and/or stator core
stator core
Defective diode Replace
Shorted stator coil Replace
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