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1974/75: "Old style" V8 dizzy cap used with DuraSpark electronic ignition.

The ignition module is mounted on the left (drivers side) inner fender apron, just in front of the firewall.

Note: The module used in 1974 is 1974 only // The module used in 1975 is 1975 only.

D4AZ-12A199-C .. 1974 Igniton Module (Motorcraft DY-157B) / Marked: D4AE-12A199-A1A or A1D or A2C or A2D.

Fits all: 1974 I-6, V6 & V8 Passenger Cars, Trucks, Bronco's and Econolines.
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D5AZ-12A199-C .. 1975 Ignition Module (Motorcraft DY-166B) / Marked: D5AE-12A199-A1A or A1B or A1D or A2A or A2B or A2C or A2D.

Fits all: 1975 I-4, I-6, V6 & V8 Passenger Cars, Trucks, Bronco's & Econolines.
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D4PZ-12A112-A .. Stator aka Magnetic Pickup Coil-mounts inside dizzy (Motorcraft DU-1A)

Fits all: 1974/79 V8 Passenger Cars, Trucks, Bronco's and Econolines except 1979 LTD/Mercury Grand Marquis 351W with EEC.
So what else is new!? This has been a common problem associated with these two ignition modules since day one. **

The three step scenario of a failing DuraSpark ignition module:

1) Module overheats, engine dies. Module cools down, engine re-starts in minutes.

2) Module overheats, engine dies. Module cools down, engine re-starts in an hour...or so.

3) Sooner or later, usually sooner, the module overheats, burns out! Now the engine will not restart.

Since the little darlin' only fails when it overheats, taking it to an autoparts store to be tested...usually doesn't work, unless it has failed altogether.

When replacing the module, uses some washers to space it further away from the fender apron.

Heat radiating from the red hot left exhaust manifold is the mortal enemy of DuraSpark ignition modules, so the more airflow around the little darlin' the better.

** These two early ignition modules were so un-reliable, that Ford techs referred to them as Never/Spark!