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Home >> Ford >> 1981 >> Thunderbird Base, 5.0L Eng VIN F >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MOTORCRAFT EEC III Ignition System >> Testing >> Module Output Check
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Module Output Check

  1. Be sure all wires and harnesses are connected. Connect positive lead of voltmeter to coil "TACH" terminal and negative lead to ground. Set voltmeter on highest scale. Ground distributor cap end of coil high tension wire. Crank engine, and while cranking, switch voltmeter to lowest scale.
  2. Meter needle should oscillate. If so, module output is OK. Proceed to Ignition Coil Primary Resistance Check . If needle does not oscillate, proceed to next test.
NOTE: If voltmeter is not available, connect test light across coil terminals. Check for light flashing instead of needle oscillation.
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