Electronic ignition for Mercruiser 170 (1985)?

[scook]

I finally got the Pertronix ignition installed and I have no spark.

• There is just short of 12 volts at both sides of the coil, so there's power and the primary has continuity.
• The secondary has continuity - I think it was around 12000 Ohms resistance - I can re-check that if it becomes important.
• Tried #1 spark plug laying on ground and also put a metal extension on the end of the coil wire and held near ground cranked it plenty long for something to happen - nothing.

I'm thinking it's either the ignition module or something wrong with the primary wiring (which I put back the way it was).

Any diagnostic suggestions will be appreciated (I'm a little above my pay grade as far as really understanding the system).