Commutator Test

Check for continuity between commutator segments. If continuity does not exist, replace armature. Measure commutator mica depth. See STARTER SPECIFICATIONS . If mica depth not within specifications, replace commutator.
Measure commutator runout. See STARTER SPECIFICATIONS . If runout is not within specifications, replace armature assembly. If commutator is burnt or dirty, clean using emery cloth or a lathe. Measure commutator diameter. See STARTER SPECIFICATIONS . If diameter is less than minimum specification, replace armature assembly.