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Except 3.8L

  1. Disconnect wiring harness connector from ignition module. Inspect connector for dirt, corrosion, or damage. Repair if necessary. If okay, reconnect harness. Connect a non-powered, 12-volt test light between coil "TACH" terminal and known good engine ground. See Fig 1.
  2. Crank engine while observing test light. If test light comes on or flashes, remove test light. Proceed to IGNITION COIL PRIMARY RESISTANCE test.
  3. If test light does not light or if it is very dim, remove test light. Proceed to PRIMARY CONTINUITY TEST.
Fig 1: Ignition Coil Primary Circuit Switching Test
G54439Courtesy of FORD MOTOR CO.
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