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Ignition Coil Testing

  1. Using an ohmmeter, check resistance between B+ terminal and base of ignition coil. See Fig 1 . Reading should be high or infinite (open circuit). If resistance is not high or infinite, replace ignition coil.
  2. Check resistance between B+ and C- terminals. Reading should be about 0.5 ohm. Check resistance between C+ terminal and coil secondary terminal. Reading should be about 8300 ohms.
Fig 1: Testing Ignition Coil
G93083Courtesy of GENERAL MOTORS CORP.
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