I have noticed that there is a capacitor mounted next to the ignition coil that has heat damage on it's insulation. In an old point type ignition that would be attached to the coil to suppress radio noise but this one has a wire that goes back into the wiring harnes so I do not know what it is attached to.That is a very valid and excellent point to ponder.
Even though that power relay powers up so many other things, the ignition primary is isolated from the rest by that fusible link, so all you have to focus on to find the source of what cooked it is that white and blue wire.
Inspect around the ignition coil. The primary wires there tend to get frayed and could easily touch against metal somewhere. The frame of the coil and the radio suppressor are the most susceptible areas.
I will test the cap with an ohm meter later today but can you guys tell me what it does.
EDIT:
I just noticed in the wiring diagram above that there is a noise suppression cap on the coil that connects to the and that must be it. It appears to go back into the harness and connect to that white/blue wire. I'll just replace it knowing that electrolytic capacitors have liquid in them that dries up over time which can cause them to short.
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