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Home >> Ford >> 1984 >> Bronco II Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - TFI-IV >> Testing >> Ignition Coil Secondary Resistance

Ignition Coil Secondary Resistance

  1. With ignition switch in "OFF" position, disconnect ignition coil connector and secondary wire from coil tower. Measure resistance between negative coil terminal and coil tower. See Fig 1.
  2. Resistance should measure 6500-11,500 ohms. If so, ignition coil is okay. Proceed to WIRING HARNESS test. If resistance is less than 6500 ohms or greater than 11,500 ohms, replace ignition coil.
Fig 1: Ignition Coil Primary & Secondary Resistance Tests
G12854Courtesy of FORD MOTOR CO.