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 TM 55-1905-222-14
Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ALTERNATOR FAILS TO CHARGE.
Step 1.
Check for excessively worn, sticky or intermittent brushes.
Replace brushes (para 5-6).
Step 2.
Test for defective rectifier diodes.
Disassemble alternator and replace diodes (para 6-5).
Step 3.
Test for open rotor winding.
Disassemble alternator and verify rotor winding continuity.
Replace rotor If open (para. 6-5).
2.
LOW OR UNSTEADY CHARGING RATE
Step 1.
Check for open, grounded or shorted turns In stator coils.
Disassemble alternator and replace stator (para 6-5).
Step 2.
Check for grounded or shorted turns In rotor winding.
Disassemble alternator and replace rotor (para 6-5).
Step 3.
Check for open or shorted rectifier diodes.
Disassemble alternator and replace diodes (para 6-5).
3.
NOISY ALTERNATOR
Check to see if alternator bearings are worn.
Disassemble alternator and replace worn or defective bearings (para 6-5).
5-5
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