No spark when cranking

OK Refer to the most recent drawing above. This drawing does show the connection through the ballast resistor.
If the wire shown in red does in fact have 12 volts in start, the wire shown in blue should have voltage, although reduced by the resistor.
I wont argue that the switch removed from the cars harness and tested for connections would show blue dead in start. The cars harness creates the connecting loop through the ballast resistor. This goes both ways too. Proof ? ... Switch connected and in run position, check the wire they marked red all the way back to the switch ( actually a brown wire ). You will find voltage there.
The above probably doesn't help to solve your problem anyway.
I'm no longer as familiar with the later model wiring. I no longer own one and my memory fails.
If I'm not mistaken there are actually 2 blue wire circuits at play here. One is a solid medium blue. The other is darker blue with a white tracer. If that is true the 2 could be or should be separate. I really just don't know. I'll say good luck with it and leave it at that.