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Ignition Coil Primary Resistance

  1. Place ignition switch in "OFF" position. Disconnect ignition coil connector. Inspect connector for dirt, corrosion, or damage. Repair if necessary. Measure resistance across ignition coil positive and negative terminals. See Figure.
  2. If reading is between 0.3-1.0 ohms, ignition coil primary circuit is okay. Go to IGNITION COIL SECONDARY RESISTANCE  test. If resistance is less than 0.3 ohms or greater than one ohm, replace ignition coil.
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