Ignition Coil

Coils are oil-filled, and are energized whenever the ignition switch is in the "ON" or "START" position. They contain a positive "BATT" terminal, a negative "TACH" (sometimes called "DEC") terminal, and a single secondary terminal.

Fig 1: Dura-Spark II Ignition System Wiring Diagram

Courtesy of FORD MOTOR CO.

Electronic control module has a 2-wire and 4-wire connector.

Fig 2: Control Module And Distributor Connectors For Dura-Spark II System

Courtesy of FORD MOTOR CO.

Compare terminal location to shape.

NOTE: "DEC" refers to Distributor Electronic Control. This terminal is also referred to as the "Tach Test" terminal.

A special connector attaches the Green wire from the control module to the negative terminal ("TACH") and the wire from the ignition switch to the positive terminal ("BATT").