Thomas, I am glad to hear that your TD6 is now running and it was a simple fix. Your question about the mag. Yes, when you switch to diesel, there is a switch inside the intake manifold that grounds the mag to shut down the spark. Some times this contact can go bad, but then you can still ground the mag with a switch. I think this was done so the mag would not have to be sparking when running on diesel thus saving the points and plugs. Just send me an email if you have any more questions as I have an MD, 450-D, and 650-D. Al
PS: Many years ago my neighbor had a WD9 that wouldn't start on gas. Turned out his kid put new points in the mag and also got it 180 out of time. Took me a little while to figure that one out as I didn't expect it to be out of time. So that is easy to do.