Apologies if already covered in this thread.
As known:
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A wire from the left-side (9 o'clock) Dyna-S pickup normally connects to the ignition coil that fires the two outside spark plugs #1 and #4 (reportedly no spark on the bike at hand).
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A wire from the right-side (3 o'clock) Dyna-S pickup normally connects to the ignition coil that fires the inside spark plugs #2 and #3 (reportedly sparking on the bike at hand).
If not already done, may test to see whether connecting the signal wire from the right-side (3 o'clock) Dyna-S pickup to the other ignition coil will produce sparks on the two outside plugs #1 and #4.
If signal wire from the left-side (3 o'clock) Dyna-S pickup produces plug spark, but signal wire from the right-side (9 o'clock) Dyna-S pickup doesn't produce plug spark through the same ignition coil, it indicates that something's wrong with the right-side (9 o'clock) Dyna-S pickup or perhaps a break or short in the signal wire from the right-side (9 o'clock) Dyna-S pickup.
Good Fortune!