If the balist resistor is jumped out the coil will fail the coil receives battery voltage while cranking only and drops to 5 volts when key goes to run position go to a parts store pick up a 15$ volt meter test coil with wires disconnected put meter on ohms or upside down horseshoe pos to neg on screws 1.8 to 1.6 ohms either screw post to coil wire 18 to 20000 ohms resistor must be rewired as constant 12 volts will overheat and kill the coil good luck