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. If saw blade vibrates, armature is shorted. Retest after cleaning between commutator
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 (R x 100) to check for “no continuity”between commutator and ar-
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