I don't have a Haynes book in front of me, but in the front or back of them they have little colored pictures that explain that stuff. I'm sure that sounds like an improper mix setting, but which way, I don't really know off the top of my head. Problem that I normally run into is white on the electrode insulator and black crud everywhere else, not the brown....

91 Jeep Wrangler YJ, carpet, tires, trailer hitch. yea....