no fire,a bit lost....

:violent1:Hello everyone.I have a 72 duster.It has a 86d250 360 stock (electronically).I bought the duster and the previous owner converted it to electronic ignition from a 73 duster parts car.I'm familiar with the motor I sold it to the guy previously.I crossed the starter relay and the motor turns over,I grounded a plug but had no spark.From the ignition switch I get nothing.I've tried the ballast resistor and straight wireing the coil to the battery and it was hot.Still nothing.Could it be the ignition switch or or a defect in the coil?I've not put a meter on anything yet....I hate wires.Any ideas???Thanks everyone