You should be getting battery voltage to the high side of the ballast resistor. Should be pulling at least 7 volts on the output side. Try spanning the ballast resistor with a set of alligator clips. If the car then will start, the ballast resistor is probably bad. Normally, when the ignition is in the start position the ballast resistor is bypassed, so you car should still start and then die when the key is moved to the run position, so you may have something other than a ballast resistor problem. Try this test and report back.
Dave
Dave