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The pickup coil is a common problem, you schould have a reading of around 80 ohms between the orange and purple wires comming from the distributor, also there schould be no reading from these wires to ground if not the coil is bad.
Check the solenoid, it should give you 6-8 volts when running and 12+ when starting. This is at the coil. I had one that would give out 1 volt when trying to run, it also was bleeding juice through to the starter all the time.