I went back to points since I had no luck with the Pretronix and installed new points condensor and 12 volt coil with internal resister. (no ballast resister) Still can't get a spark. I have 12vots at the positive terminal of coil with ignition switch on. I attached a test lamp to the wire coming from the negative coil terminal to the distributor. With points cl;osed I have the light on. When points open , I the light stays on , From what I read, if the test lamp attacked to the lead to the distributor never goes out, then there is a problem . Since the points are new, the only thing I can think of is the distributor is not grounded. How do you check this?