No spark- what am I missing?

Dist shaft spins with engine.

Points spark as shaft turns.

Coil discharges if 12v lead to dist is grounded via external jumper.

Defies logic.


I considered a poor 12v lead to dist, so I added my jumper in parallel-

No change.

I considered a bad ground path from dist plate to block/batt...

...but why would the points spark if that were the case?