If you are still using the points distributor (since you have a 6 volt coil) I would check the single black wire from the dist to the coil and the resistance of the coil. You will have to check the primary and secondary resistance with a ohm meter. The primary resistance is between the two screw posts. You need to set the meter to the 200 ohm setting (or lowest setting). You should get between .4- 1.1 ohms of resistance. The secondary resistance is from either of the screw posts and the coil discharge (the area where the coil wire to distributor cap is. Make sure there is no corrosion in the coil tower where the coil cable is. Set the ohm meter scale to 20,000. Your reading should fall between 6,000- 11,000. If there is no problem here I would check the cap and rotor, especially the center carbon pile button that contacts the rotor. Also check the botom of the rotor for carbon tracing. Sometimes the spark will jump through the rotor to the distributor. Heavy black powder is usually a good sign of this. Another possibility is that the breaker plate that the points are mounted on sometimes contact the wire from the coil which acts like the points are always closed.
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