Operation CHARM
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GMC Truck
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1983
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C 2500 3/4 Ton Pickup 2WD V8-454 7.4L VIN W 4-bbl
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Repair and Diagnosis
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Cruise Control
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Testing and Inspection
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Initial Inspection and Diagnostic Overview
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System Diagnosis
System Diagnosis
Fig. 11 Cruise system wiring diagram. 1983---84 Custom Cruise III:
Fig. 12 Cruise system wiring diagram. 1985---87 Custom Cruise III (typical):
Refer to
Figs. 11 and 12
during component testing procedures.