Reply to "Duraspark Ignition Question"

Well Scott,

I'll be dammed. There was electronic ignition on '74 California cars, I can remember that much. I never stopped to consider what module they used, but I guess it had the black strain relief. The "D4" in the D4AZ part number decodes as 1974.

So I pulled out my books and here's what I learned:

The '73 - '74 vintage ignition was installed in some 460 V8 equipped Lincolns in 1973. In 1974 it was standard in the 49 state cars equipped with 400 or 460 V8s, and California cars equipped with 6 cylinder motors or any V8. In 1975 electronic ignition was installed in all Ford products, and the box with the green strain relief was introduced.

The ballast resistance for this module is 1.4 ohms; the primary resistance of the coil is 1.0 to 2.0 ohms, measured between the "bat" & "dec" terminals of the coil; the secondary resistance of the coil is 7K to 13K ohms, measured between either the "bat" OR "dec" terminal of the coil and the center tower.

your friend on the DTBB