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Coil Test

  1. Turn ignition off. Disconnect ignition coil electrical connections. Using a DVOM, measure resistance of primary and secondary coil circuits. Measure primary circuit resistance between battery terminal and terminal for cylinders being checked. See Fig 1 .
  2. Measure secondary circuit resistance across coil towers. See Fig 1 . See IGNITION COIL RESISTANCE  table. If resistance is within specification, ignition coil is okay. If resistance is not within specification, replace ignition coil.
IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)

Application Primary Secondary
LHS & New Yorker .45-.65 7000-15,800
Fig 1: Identifying Ignition Coil Primary & Secondary Circuits
G95E13643Courtesy of CHRYSLER CORP.
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