No spark but 1 spark on "shutdown"

I don't know how my reply will apply to a bunch of aftermarket stuff. From the factory...
There are 2 wires from ignition switch to spark/ignition, a blue and a brown. When one of them faults you'll get sparks in start but not in run. When the other faults you'll get no sparks during start and only 1 spark as switch is released back to run.
Many aftermarket ignition systems require tying these 2 wires together and/or deleting the ballast resistor.