Finally fixed. Car needed both the powerblock (main cable) and the cable assembly that includes both terminal cables as well as starter cable and all grounds. I also put in a new battery for good measure. Since I live in Las Vegas, I contacted Bill Jenkins at Team Ford and got both cables for $220 (retail close to $400). Had local shop put them in for another $200 and a new battery for $46. I was getting tired of going out every other day to jiggle the starter wire to get a spark. In at least 8 spots, the wires were frayed with little or NO insulation left. I think it was a disaster waiting to happen if I got an arc to the PCM.
Just so you know, there was a design change and you can't just buy either one, you need both as Ford redesigned the connectors. It look like a better design.
I really can't complain since this is the first major repair in well over 2 years with now 217,000 miles on the car.