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Home >> Ford >> 1988 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - TFI-IV >> Testing >> Ignition Coil Primary Resistance
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Ignition Coil Primary Resistance

  1. With ignition switch in "OFF" position, disconnect ignition coil connector. Inspect connector for dirt, corrosion or damage. Measure resistance across ignition coil positive and negative terminals. See Figure.
  2. Resistance should measure .3-1.0 ohm. If so, ignition coil primary circuit is okay. Proceed to IGNITION COIL SECONDARY RESISTANCE test. If resistance is less than .3 ohm or greater than one ohm, replace ignition coil.
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