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If your not getting a spark, first check the primary circuit to make sure that you have battery voltage to the coil with the key on and the points OPEN. You should have battery voltage on both sides of the coil with the points open. If the battery side shows less then battery voltage, you have some high resistance in the circuit from the battery to the coil. Check that circuit, including the key switch. You can also run a jumper from the battery directly to the coil and check the spark. If you get a spark, you know that the primary circuit has a problem. If the battery side of the coil shows battery voltage and the distributor side shows near zero with the points open, you have a short in the wire to the distributor. Now close the points, and the distributor side of the coil should drop to near zero. If it doesn"t, your points are dirty or corroded or you have a bad disributor ground. Finally, check the center wire from the distuibutor to the coil by removing it from the cap and the coil. Sometimes they get corroded and don"t conduct. Check the rotor contact with the burtton in the top of the cap and make sure it making a connection. Finally, make sure that distributor shaft/bushing is not badly worn. With the points closed push radially(from the side ) on the distributor shaft and watch the points. They should not move. The allowable shaft run out is about 0.002". A badly worn shaft will rotate and wobble badly enough to give you an intermitent or very weak saprk or possibly no spark at all.
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