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15-22 ELECTRICAL SYSTEM
2. Shaft
1. Segment
1. Commutator
2. Emery Cloth
NOTE
OEven if the foregoing checks show the armature to be
good. it may be defective in some manner not readily
detectable with an ohmmeter. If all other starter motor
and starter motor circuit components check good. but
the starter motor still does not turn over or only turns
over weakly. replace the starter motor with a new one.
.Measure the diameter of the commutator.
* Replace the starter motor with a new one if the
commutator diameter is less than the service limit.
Brush Lead Inspection
.Using the x 1 .0 ohmmeter range, measure the resist-
ance as shown.
(+) Brush and (+) Terminal
( -) Brush and End Cover
3. Shaft
1 .Commutator Segment
2. Diameter
Commutator Diameter
Standard: 24 mm
Service Limit: 23 mm
A. (-) Brush
B. (+) Brush
c. { + ) Terminal
*If there is not close to zero ohms, the brush lead has an
open. Replace the terminal bolt assembly and/or the
brush holder assembly.
Armature Inspection
.Using the x 1 Q ohmmeter range, measure the resist-
ance between any two commutator segments.
* If there is a high resistance or no reading ( 00 ) between
any two segments, a winding is open and the starter
motor must be replaced.
.Using the highest ohmmeter range, measure the resist-
ance between the segments and the shaft-
* If there is any reading at all, the armature has a short and
the starter motor must be replaced.