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OK, I dug around the garage and found a ballast that reads .7 ohms. Might be the one that came with the MSD coil, I dunno. Still seeing less than 5 volts at the coil!  Went over the wiring to the ballast and the box, seems OK. Jumpered the ballast out, I get 8.3v at the coil, engine off. Was tempted to start it just to see, but didn't want to fry my only chrome box.
BTW, are ballasts rated hot or cold? The .7 ohm one read more like 1.5+ after running the engine a bit.
With the ballast jumpered out you should see battery voltage at the coil. Since you are not you need to find out where you lost the voltage, probably at the ignition switch. I would measure the switched 12V at the ignition switch and see what that is, if it's low measure the voltage into the switch. If the switched 12V is OK at the ignition switch then the wire between the switch and the balast is the issue.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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