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You do fine work!
Well I am only going by what I remember working on the old Chryslers with the ballast resistors. If I remember correctly, I believe the resistor cut the voltage down to about 9 volts. I may be wrong but that is what I remember. What if you took the original resistor that was in the motor and hook it up to a battery positive terminal and the other side through a volt meter back to the battery negative terminal. Read the voltage and see what it drops to. If it is close to 11 volts, you may be good. If it drops it lower to 6-9 volts, get a different ohm ballast resistor and retest.