Final functional test of actual lower-voltage going into ignitor failed. That's why there's no spark.
Post photo of resistor on ignition switch. Most likely it's not properly wired up. Probably connected in parallel instead of in series with grey wire. In which case, electricity takes path of least resistance and flows around resistor unimpeded on grey wire.
Final resistance of parallel circuit is:
1/R = 1/0 ohms+ 1/330 ohms
R = 0 ohms
With resistance = 0 regardless of resistor value, you'll get full battery voltage at ignitor and it'll think it's getting hot-wired and refuse to start. Whoever wired in original 100-ohm resistor probably messed up and wired in parallel and it didn't work (plug 100-ohm into equation above). So they tried higher resistance value, which also didn't work because electricity just bypassed resistor completely. So they gave up.
Post photo of how resistor is connected to ignition switch and this will be very simple solution.
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