Quote Originally Posted by Bill R.
primary winding. In other words making and breaking the ground on the primary winding. One end of the primary is hot as you can see and the other end goes to ground through that transistor in the dme that switches on-off or triggers as you think of it. When that field is broken or not allowed to go to ground that induces the spark on the secondary winding and to the sparkplug.

So grounding Pin 1 means there is no spark... and when you let that ground off it then sparks? So kind of like the opposite of what you'd expect?