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Ignition Coil Resistance

  1. If ignition coil is suspected, connect ohmmeter leads to positive and negative ignition coil primary terminals. Ignition switch should be "OFF" and coil wires removed. Primary resistance should read 1.60-1.79 ohms for Prestolite coils; 1.34-1.55 ohms for Essex coils.
  2. Connect ohmmeter leads to ignition coil negative terminal and ignition coil tower. Ohmmeter resistance reading should be 9400-11,700 for Prestolite coils, 9000-12,200 ohms for Essex coils.
  3. Replace ignition coil if either specification is not obtained.
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