Armature; Armature Short Circuit Test; Armature Winding Ground Test; Armature Winding Continuity Test - Isuzu A-4JA1 Workshop Manual

ENGINE ELECTRICALS
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is dis-
covered during inspection.
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INSPECTION AND REPAIR

ARMATURE

Armature Short Circuit Test

1

Armature Winding Ground Test

Check for continuity across the commutator segments
and the core.
If there is continuity, the armature is internally grounded
due to insulation failure and must be replaced.

Armature Winding Continuity Test

Check for continuity across the commutator segment.
If there is no continuity, the armature coil is open and
must be replaced.
1. Place the armature on a growler tester 1.
2. Hold a hack saw blade 2 against the armature core
while slowly rotating the armature.
If the armature is short circuited, the hack saw blade
will vibrate and will be attracted to the armature
core.
A short circuited armature must be replaced.