Armature Tests - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

Armature Tests

TEST FOR SHORTS
Check armature for shorts by placing on growler and holding hack saw blade over armature
core while rotating armature. If saw blade vibrates, armature is shorted. After cleaning
between commutator bars, recheck. If saw blade still vibrates, replace armature.
TEST FOR GROUND
1. With continuity meter, place one lead on armature core or shaft and other lead on com-
2. If meter hand moves, armature is grounded and must be replaced.
Index
90-861326--1 MARCH 1999
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a - Hacksaw Blade
b- Armature Core
c - Growler
mutator.
a - Commutator
b- Armature Core
c - Shaft
d- Growler
a
b
c
c
b
d
a
STARTING SYSTEM
01440
01441
Page 4A-41