So, I think I posted else where about the ignition wiring harness connectors for my stupid 68. I have replacement connectors for the harness side, but am now not in a position to spend the time to fix the harness. I’m getting ready to swap the engine out,l (again) and thought, that if I put B+ 12 volts to the + side of the coil, and shorted the solenoid, the car should start and run long enough to move it around the yard and get into position for the next labor operation. Car was a crank, no start. It has a duraspark distributor with an MSD box. I got pulled away for a minute and forgot to disconnect the coil, and it blew up. So, hurray for me. But the question remains, what would cause this no start?
The MSD receives it’s power through the heavy gauge Black and Red wires. The light gauge Red wire is the 12v signal to turn the ignition box on.
Other than the ignition wiring behind the ignition switch, everything was working perfectly. The MSD is wired properly. The car was still a crank, no start, like it had no spark. I haven’t pulled the distributor apart yet to see by chance if the duraspark module broke, again. I thought B+ directly to the coil + would have started the car and run, long enough to move it 50 yards…
Applying 12V to the Coil (+) lead will do nothing on an MSD box. The MSD powers the coil, not the other way around. You have to apply 12V to the light gage red wire for the box to work.