67 Barracuda Ignition Issue

Here are some of my amateur electrician observations:
1. The 12.5 volts at all 4 poles of the ballast seems correct. Guessing the top 2 poles would likely drop due to the ballast once current is applied.
2. Seems like 10.5 volts at the top right ballast pole is low with the key in start position because start position should provide 12.5 volt bypass. I am guessing that 10.5 volts would be enough to start the car though if the 10.5 volts went to the coil positive.
3. Should the top right ballast plug (brown and blue wire) connect directly to the coil positive or does it go through some other plug, harness, or electrical device? The car has a new wiring harness (lots of wrapping) so I cannot follow the wire back from the coil without unwrapping the harness.
4. Seems like the ECM is not a problem because the car starts with power to the coil.