Alternator
OPERATION NOISY
CAUSE REMEDY
Worn or dry bearings Replace worn bearings
Alternator mounting loose Tighten alternator mounting
Belt loose Replace worn belt or tighten loose belt
Brush holders out of alignment Replace brush holders
Brushes not seated properly Reseat or replace brushes
Armature unbalanced Replace armature
Commutator out-of-round Dress commutator
Loose windings Replace defective windings
Armature rubbing Replace bearings
EXCESSIVELY HIGH ALTERNATOR ELECTRICAL OUTPUT
CAUSE REMEDY
Alternator regulator out of adjustment Replace regulator
Field leads shorted Replace or repair alternator
Alternator regulator shorted Replace regulator
ALTERNATOR MECHANICALLY INOPERATIVE
CAUSE REMEDY
Belt loose Tighten belt
Armature shaft sheared Replace or repair alternator
LOW OR NO ALTERNATOR ELECTRICAL OUPUT
CAUSE REMEDY
Field coil open Replace or repair alternator
Brushes dirty, worn, pitted, or burned Replace or repair alternator
Alternator regulator defective Replace regulator
Alternator to regulator field leads open or
connections loose
Tighten connections or replace field leads
397P/N 12261-683 REVISED: January 2015
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