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Home >> Ford >> 1979 >> Fiesta >> Repair and Diagnosis (Single Page) >> Engine Performance >> Ignition System >> MOTORCRAFT DURASPARK II Electronic Ignition >> Testing >> Control Module Feed Test >> Red Wire Circuit
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Red Wire Circuit

  1. If no spark occurred in step  3) of BASIC SYSTEM TEST, measure battery voltage. Using a straight pin, puncture Red wire of control module's 2-wire harness (between module and connector). See Figure.
  2. Connect voltmeter positive lead to straight pin and negative lead to ground. Voltage on Red wire should be within 1 volt of battery voltage. If so, proceed to step  1) of COIL PRIMARY CIRCUIT TEST.
  3. If not, repair Red wire circuit and repeat previous tests. If spark occurs at modified plug, ignition system is okay.
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