If the Ballast Resistor is sized correctly to match the coil, Id expect more like 5 to 7 volts on the coils input WHEN POINTS ARE CLOSED. If youre putting 11 volts on a 6 volt coil the intended points n coil current is nearly doubled and the coil runs hot plus the points burn up prematurely. Also if the condensor is weak or open the points burn up much sooner but your problem sounds like not enough ballast resistance.
Typical ballast resistors for 12 volt systens rrunning 6 volt coils are in the 1.5 to 2 ohms range, you may wanna check yours.. Or else get a full true (some call internally ballasted) 12 votl coil no ballast required.
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