I had one many years ago, check the pigtail inside the box to insure it is wired for the 6cly not 8cyl, do you have 12v when you are in the start position? I remember mine having a problem not turning off when I hooked a MSD to it and I had to add a resister in line with the brown wire on the alternator. Once its working its an awesome setup, my 6cyl was so tired it would die in between shifts until I put the MSD on it