Duster turns over but wont start

Hey guys so I have an electrical problem that has resurfaced. the duster will crank all day long but wont start. drove it into garage just fine and now nope it's dead.

I have done a ton of research and had a lot of electrician guys help me with no luck. I have: Replaced the ECU twice to make sure I got a good one
replaced the ballast resistor
replaced the magnetic hookup
and replaced the coil
All the points, cap and rotar look good and clean but I am getting no spark out of my coil. The confusing part is I am getting battery (12ish volts) to the positive side of my coil in the run position (with the wire unhooked from coil) but when I start cranking the voltage drops to a dead zero. To fix this we temporarily jumped 12volts from the battery directly to the coil (unhooking the wireing harness wire of course)
This ensured we WERE getting 12 volts to the NEW coil (and old one since test was performed both times) and no spark out of it. This leaves the negative terminal? I unhooked the tach for now but I am at a loss. we tested 6 ways to saturday too, with old ecu box, old coil, jumping across ballast resistor and any combination of those. nothing does anything to help.

All new components and jumping 12 volts to the coil and it wont even make a hint of starting, even if it did I'm only getting 12 volts on the run, and 0 volts on the start. Im confused. any electrical guys out there?

Thanks