New Holland WorkMaster 50 Service Manual page 678

Alternator - Troubleshooting
Problem
No charging
Insufficient charging
Overcharge
Unstable Charging Circuit Wiring: Loose connection or open wire.
Abnormal Noise from
Alternator
Electrical systems - Alternator
Possible Cause
Wiring: Loose connection or short circuit. Repair.
Alternator: Loose connection, no ground,
or short circuit.
Alternator: Defective rectifier.
Regulator: Defective regulator.
Regulator: Loose connection of alternator
or regulator.
Wiring: Loose connection or short circuit. Repair.
Alternator: Loose drive belt.
Alternator: Short in rotor coil.
Alternator: Short in stator coil.
Alternator: Defective rectifier.
Alternator: Insufficient brush contact.
Regulator: Defective regulator.
Regulator: Loose connection of alternator
and regulator.
Battery: Defective Battery.
Battery: Internal short.
Regulator: Defective regulator.
Alternator: Loose drive belt.
Alternator: Short in rotor coil.
Alternator: Short in stator coil.
Alternator: Broken brush or spring.
Alternator: Loose connection.
Regulator: Defective Regulator.
Regulator: Loose connection at alternator
and regulator.
Alternator: Loose mounting hardware.
Alternator: Defective bearings.
Alternator: Rotor core and stator in contact. Replace.
Alternator: Defective diode.
Alternator: Short in stator coil.
47866583_ 02/12/2015
55.6 [55.301] / 3
Correction
Repair or replace.
Replace.
Replace.
Repair or replace.
Repair.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Repair.
Replace.
Replace.
Replace.
Repair or replace.
Repair.
Replace.
Replace.
Replace.
Repair.
Replace.
Repair or replace.
Repair.
Repair or replace.
Replace.
Replace.