DS III

Distributor exploded view:

Bi-level rotor & distributor cap:

The EEC system uses a Dura Spark III ignition module and coil to generate the required high voltage spark. Distribution of secondary voltage to the spark plugs is accomplished with a unique distributor used exclusively on the EEC systems, Fig. 21. All ignition timing is controlled by the ECA. There are no mechanical or vacuum advance mechanisms used with this distributor.
Since this system is capable of firing a spark plug at any point within a 50° range depending on calibration, the increased spark capability requires greater separation of adjacent distributor cap electrodes to prevent cross fire. The distributor cap and rotor are of a special two level design, Fig. 22, made to accommodate the additional advance capability of this system. Both the rotor and cap have upper and lower electrode levels. As the rotor turns, one of the high voltage electrode pickup arms aligns with one spoke of the distributor cap center electrode plate, allowing high voltage to pass from the plate through the rotor to the terminal on the distributor cap and out to the spark plug.