Attack of the coil killer!

whats the alternator voltage, It should allways be less than 15 volts with the engine running, the ballast resistor drops the voltage after the starter is disengaged. So the voltage across the ballast resistor +the coil voltage should equal the battery voltage. If it does than that verifies coil wireing ok, If the sorce voltage is high than you have an altornator/regulator problem'