Strange ignition issue

I just put in a rebuilt 360 and completed reworking the harness. 43 years of people tapping connections into an old harness looked like a spider web of crap...

Anyhow, the issue I'm having now is when I turn the key to "run", I have power at the ballast resistor. I have power to the + wire to the coil, but as soon as I connect the - wire to the coil, the system seems to ground out. My test light doesn't read any power to either side of the coil, and the ballast and coil get warm. Anybody experience anything similar?

The ecu grounds to the firewall when it bolts up obviously... I'm at a loss