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Home >> Jeep >> 1985 >> Scrambler Laredo, 4.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> Ignition System - Solid State >> Testing >> Ignition Coil Resistance Check >> Primary Resistance
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Primary Resistance

  1. Remove connector from positive and negative coil terminals. Be sure ignition switch is "OFF". Set an ohmmeter on low scale and connect ohmmeter leads to positive and negative terminals.
  2. Ohmmeter reading should be 1.13-1.23 ohms at 75°F (24°C). With coil temperature at 200°F (93°C), a 1.5 ohm reading is acceptable.
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