New Holland LS140 Workshop Manual page 551

UNSTABLE CHARGING CIRCUIT
FAULT LOCATION
Wiring
Alternator
Regulator
ABNORMAL NOISE OF ALTERNATOR
FAULT LOCATION
Alternator
SECTION 55 - ELECTRICAL SYSTEM
POSSIBLE CAUSE
Loose connection or open wire
Loose drive belt
Short in rotor coil
Short in stator coil
Insufficient brush contact
Broken brush or spring
Loose connections
Defective regulator
Loose connection at alternator and
regulator
POSSIBLE CAUSE
Loose mounting hardware
Defective bearings
Rotor core and stator in contact
Defective diode
Short in stator coil
55-126
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CORRECTION
Repair or replace
Repair
Replace
Replace
Repair or replace
Replace
Repair
Replace
Repair or replace
CORRECTION
Repair
Repair or replace
Replace
Replace
Replace