Overcharging Issue & Car Start Issue

I have a question about one of the steps you mentioned in checking the voltage drop in the wiring harness.

You stated "Turn the key to "run" but with engine off. Select "low DC volts" range on the meter, put one probe on the battery positive post, the other on the blue field wire, and or, the IGN feed to the ballast and regulator IGN terminal"

When you put the probe on the blue field wire are you disconnecting any of the wires when your making these checks?

Another question I have is what is IGN1 used for ? Is it the line that is used when your key is turned backwards ? The reason I ask is when I do continuity checks on my ignition switch from Battery to IGN1 I have no continuity when the key is placed in run and start. These measurements were made at the connector end of the steering harness.