70 up charging system upgrade question

I like Mattax's ideas. I am going to draw up a schematic of my Valiant "as built". I am willing to bet you have a broken wire inside the insulation with only a few strands carrying current. I came across this once and I think it was a bad splice made in the manufacture of the wire to extend the run. Any way you probably have these but I post them just in-case you can use them.
PS nice bass at least some one is getting some R&R.

67BarracudawiringA.jpg

67BarracudawiringB.jpg