BATTERY CHARGING AND STARTING SYSTEMS
Page 2B-18 90-826883R2 JUNE 1998
Testing Motor Armature
TESTING ARMATURE FOR SHORTS
1. Place armature in a growler and switch growler on.
2. Hold hack saw blade over armature core while rotating armature.
3. Ifsawbladevibrates,armatureisshorted.Retestaftercleaningbetweencommutator
bars. If saw blade still vibrates, replace armature.
01440
b
a
c
a - Hack Saw Blade
b - Armature Core
c - Commutator
TESTING ARMATURE FOR GROUND
1. Use an ohmmeter (Rx 100) to checkfor “nocontinuity” betweencommutator andar-
mature core or commutator and shaft.
2. If continuity exists, armature is grounded and must be replaced.
01441
c
a
b
a - Commutator
b - Armature Core
c - Shaft
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