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there should be 12 volts at the positive side of the coil with the key on. the power comes from the ignition switch. since you replaced the switch, you most likely have a broken wire between the switch and coil.
ok, do you have points or electronic ignition???
ok, with 12 volts on the positive, you should have 12 volts on the negative side of the coil too. if you do, then crank the motor and use a test light on the negative side and it should flash while cranking. if it does not, then you need a module and pick up coil. if it does then the coil is bad.