Okay so I picked up a 87. It had no wiring harness on it. I wired it with a simplified diagram from another post. I am not getting any spark. Battery was at 12.6 volts. I checked power to the coils and I am getting 4.9 volts. Would this be a bad ignitor box? Is there anyway to test it? Both post on the coils were getting 4.9v. Also do you have to have the three diodes or a coil relay?