Ignition Circuit Voltage Drop…where to from here?

Also, I decided to check the IGN1 circuit from the firewall and unravel all the surprises that awaited me! Check this out - the charred wire is the path to the voltage regulator. Possibly yet another reason for my voltage drop?

Needless to say, I'm going to rewire that entire circuit from the firewall to every path it branches off to in the engine - maybe i'll use a larger gauge wire while I'm at it.