225 having some trouble firing up

it will ground thru the ECU when told to by the pickup in the dizzy. on points dizzy it will ground thru the points themselves.

Ah! I think I understand it all now.

So the distributor should be causing it to alternate between hot and ground, correct? Problem is, it doesn't alternate at all. It just stays full-hot when the engine is trying to crank. Unless I'm misunderstanding, which is entirely possible, because I don't profess to be the most inclined person in the world on these parts, that might mean that the distributor isn't turning to hit a point? Which would explain why we're not getting a spark from the plug wires?

Or, would the problem more likely lie in this ECU?