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Run Circuits Check

Fig 1: Ignition Diagnostic Test Adapter and Spark Tester Hook-Up for Run Circuits Checks
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  1. Disconnect ignition module 3-wire connector and install ignition Diagnostic Test Adapter (T79P-12127-A or equivalent) as shown in Fig 1. Disconnect ignition coil wire from distributor and connect spark tester to wire and engine ground.
  2. Turn ignition switch to "RUN" position and touch diagnostic adapter lead to positive battery terminal. Sparks should occur at tester gap each time lead touches battery terminal. Turn ignition switch to "OFF" position, remove spark tester and remove ignition diagnostic test adapter. Reconnect all wires.
  3. If sparks occurred at tester gap, proceed to Start Circuits Check. If no sparks occurred at tester gap, proceed to Ignition Coil Primary Circuit Switching Check.
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