TM 5-3805-262-342-6. ALTERNATOR TROUBLESHOOTINGMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ALTERNATOR NOT CHARGING BATTERIES.Step 1.Disassemble alternator (page 3-202).Inspect brush holder for worn or damaged brushes.a. If brushes are worn or damaged, replace brush holder andreassemble alternator (page 3-214).b. If brushes are okay, go to step 2 below.Step 2.Test stator (page 3-213).a. Replace stator if defective and reassemble alternator (page3-214) .b. If stator tests okay, go to step 3 below.Step 3.Test diode trio (page 3-211).a. Replace diode trio if defective and reassemble alternator (page3-214) .b. If diode trio tests okay, go to step 4 below.Step 4.Test rotor (page 3-213).a. Replace rotor if defective and reassemble alternator (page3-214) .b. If rotor tests okay, replace rectifier bridge and reassemble al-ternator (page 3-214).2. ALTERNATOR NOISY.Step 1.Manually turn rotor shaft and check that rotor rotatesa. If rotor shaft does not rotate freely, disassemblefreely.alternator(page 3-202). Inspect and replacesary. Reassemble alternator (pageb. If rotor shaft rotates freely, goStep 2.Disassemble alternator (page 3-202).Test rectifier bridge (page 3-212).alternator bearings as neces-3-214) .to step 2 below.a. Replace rectifier bridge if defective and reassemble alternator(page 3-214).b. If rectifier bridge tests okay, replace stator and reassemblealternator (page 3-214).2-76
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