The majority of the wire failures on large HEI magnetic pickups are fraying of, then intermittent connection to the two terminals inside the plastic connector that fits the two wires onto the end of the HEI module. At that wire to terminal junction is where the most movement occurs between the wires and module as the pickup rotates.
As I have written elsewhere, there are two ways to obtain a new pickup coil. As a simple coil, which is not the best way, because when the pickup is disassembled to replace the coil, there is no real easy way to center the outer reluctor so it doesn't hit the inner reluctor, unless you build a centering tool, and you need a lathe to build one that is accurate. Second, the easiest way, purchase the entire fully assembled, and factory centered pickup assembly, still not radically expensive. .
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