Hello all, I have a few questions about the Bosch Magneto on my Buick. I believe it's a ZU4 but that is only going by pictures. The engine has no spark so I am trouble shooting the issue. I came up with both sides of the points are grounded when the point are open. Just an fyi the wire to the key is disconnected. I can see that the fixed side of the points is supposed to be isolated from ground. I have found that the center bolt that holds the fixed point side is what is going to ground. There is no insulation on it so it is obvious that when it gets screwed into the mag housing it is groun