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Ignition Coil Resistance (Internally Mounted)

  1. Turn ignition off. Remove distributor cap and coil assembly. Invert cap. Set ohmmeter to low scale. Connect leads to coil BAT and TACH terminals. See Fig 1. If resistance exceeds approximately zero, replace ignition coil.
  2. Set ohmmeter on high scale. Connect one lead to coil secondary terminal and other lead first to TACH terminal and then to ground terminal. If resistance reading in BOTH instances is infinite, replace ignition coil.
Fig 1: Testing Ignition Coil Resistance (Internal Coil)
G90I15782Courtesy of GENERAL MOTORS CORP.
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