I'm using figure 2 in this link now.
link http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB8QFjAA&url=http%3A%2F%2Fwww.pertronix.com%2Fsupport%2Fmanuals%2Fpdf%2Fignitor12vneg.pdf&ei=AdUdVaGcIdC1sAToz4CwDA&usg=AFQjCNH_kEbUdAOmrSd-ztFD8kBHs5512w&bvm=bv.89947451,d.cWc