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Ignition Coil Testing

  1. Measure resistance between B+ terminal and base of ignition coil. See Fig 1 . Resistance should be infinite (open circuit). If resistance is not infinite, replace ignition coil.
  2. Measure resistance between B+ and C- terminals. Resistance should be about 0.5 ohm. Measure resistance between C+ terminal and coil secondary terminal. Resistance should be about 8300 ohms. Replace ignition coil if measurements are not as specified.
Fig 1: Testing Ignition Coil
G93083Courtesy of GENERAL MOTORS CORP.