Mercury 305 CID - Armature Tests; Brushes and Brush Holder

STARTING SYSTEM - 4A-3390-823225--1 1096
Armature Tests
TEST FOR SHORTS
Check armature for shorts by placing on growler and
holding hack saw blade over armature core while ro-
tating armature. If saw blade vibrates, armature is
shorted. After cleaning between commutator bars,
recheck. If saw blade still vibrates, replace armature.
01440
b
c
a
a - Hacksaw Blade
b - Armature Core
c - Growler
TEST FOR GROUND
1. With continuity meter, place one lead on arma-
ture core or shaft and other lead on commutator.
2. If meter hand moves, armature is grounded and
must be replaced.
01441
b
c
d
a
a - Commutator
b - Armature Core
c - Shaft
d - Growler
Brushes and Brush Holder
INSPECTION
Replace brushes and holder when brush leads are
touching guide.
Make sure brushes move freely in guides.
72069
b
a
a - Brush Leads
b - Guide