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Home >> GMC >> 1985 >> Forward Control 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - HEI (Federal) >> Wiring Diagrams
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Wiring Diagrams

Fig 1: Delco-Remy HEI System Schematic Module terminal letters may vary by model.
G17007
Fig 2: Electronic Spark Control (ESC) HEI System Schematic
G50D00532
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