jpc3006-1

Yes, the terminal on the ballast resistor with the higher voltage is the ignition side. I would move your red Pertronix wire from the coil + side to that terminal, that is how I have it hooked up and that's what Pertronix shows in their diagram. You measured 10V and that seems to be on the low side but may be OK if the engine is not running and the alternator not charging. When I installed the Pertronix on my car I cleaned all of the electrical connections on the resistor and coil. After 50+ years there may be some dirt or corrosion on the terminals/connectors. Also, you probably know, but do not leave the ignition in the "ON" position very long with the engine not running as it can overheat and damage the Pertronix module.

Senna, Regarding your Pertronix installation I noticed in the first picture above it appears that you have the ballast resistor in the circuit. If this is true you should move the positive lead for the Pertronix module to the ignition (12 vdc) side of the ballast resistor. I you have bypassed the ballast resistor then your connections to the + and - sides of the coil are correct. I've attached the Pertronix installation guide for your information as it explains why I am making this comment. JPC Pertronix Installation .pdf