I've been chasing down a running problem for a week or so now on my 47 Plymouth. Stock engine , but converted to 12 volt negative ground about 20 years ago. Car runs rough and dies out sometimes and won't restart for about 5 minutes. With a test light it will have power on both sides of the coil, but no spark. I have new points and condensor that I haven't installed yet. Checking the ignition circuit, I have 13.5 volts going to the ignition resistor and about 8.4 coming out and going to the coil. The negative side of the coil going to the distributor has about 5 volts. Shouldn't I have the 8.4 volts on both sides of the coil? I also recently ran a wire from the I terminal on my solenoid to the positive side of the coil for faster starts. I've noticed now I have power at the I terminal when the engine is running, not just on start up. It has become harder to start whether I disconnet the wire from the I terminal or leave it connected. This doesn't seem right and wonder if it's going to cause problems with the solenoid. Thanks in advance.