I ment the little wire that is at the starter, the one that comes from the ignition switch, I thought it would drop maybe little to nothing but I lost about 2 volts when I tested it. To this day I still don't know why it did that. I never did test it after I added that second wire.By "lead wire" do you mean the big main battery cable that hooks up directly from the positive battery cable to the starter?
During no-starts, I measured 12.1 volts at the ignition switch of the small black-red wire that goes to the starter. I can imagine another 0.1 volt drop measured at the end of the wire at the starter.