I have a 1987 150gt that is not sparking. I unplugged the black/yellow wires to each powerpack and I get spark on all cylinders. My book said if that happens to replace the keyswitch and kill switch on the control box. Did that and still no spark. I tested the ground connection between the 2 m terminals on the back of the keyswitch and the kill switch and key are working properly. I then checked the ground signal by unplugging the black/yellow wires at the powerpack and I was getting a ground signal when using the keyswitch which is what I want right? The ground signal kills the ignition when you want it to shut off. What am I missing??