Bench Testing: Armature

1992 Isuzu Rodeo LS, 4WD, StandardSECTION Armature
CAUTION: Some starters have a molded-type commutator. DO NOT undercut insulation, as serious damage to commutator may result.
  1. Test armature for shorted coils with a growler. Check for grounded coils with a test light. Place one lead on armature shaft and other lead on commutator. Test light should not come on. If test light comes on, armature is grounded and should be replaced.
  2. Turn commutator in a lathe if it is rough, worn, or has protruding insulation. Sand commutator lightly with 240 grit emery paper and clean out slots.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.