Ford Duraspark II Ignition Wiring Diagram - Reduced Voltage Coil (Blue Connector)

This is a color-coded wiring diagram by MustangSteve (mustangsteve.com) showing how to wire a Ford Duraspark II ignition module (the version with the blue connector) into a vehicle, commonly referenced for Duraspark conversions. A legend defines current flow: red arrows indicate the START circuit and green arrows the RUN circuit; gray lines represent existing vehicle wiring. The diagram shows the starter relay with its "S" and "I" terminals, a brown wire from the relay "I" terminal carrying 12 volts in "start" only to the coil (passing through the firewall), and a white wire path. Power in RUN comes from the ignition switch through the factory pink resistance wire, which drops voltage to 6-9 volts (reduced voltage coil setup); the diagram notes tapping the red wire to a plug approximately 4 inches from the ignition switch for 12 volts. The Duraspark module's wire colors are labeled: White, Red, Green, Orange, and Purple, with Black to ground/other circuit, and Green, Orange, and Purple running to the distributor pickup module. A Red/Blue wire and a second "12 volts in 'start' only" feed are also shown. A reader can learn the complete hookup of coil, starter relay, ignition switch, distributor, and Duraspark II module.