'86 syncro

I'm looking to solve a weak spark problem. Battery voltage is present at the coil (D15 power currently coming from G2).
Coil has been swapped.
New dist. cap and coil wire (swapped).
Grounds re-cleaned below coil.

Am I correct that the coil ground is through ECU pin 19? Under the coil?
My brain is as weak as my spark right now.

Thanks for any help,

Angus