[Ernie Vitucci]

Good Morning...sometimes the plugs in the headlights and the lights get to vibrating at high Model A Speed...you might consider disconnecting the lights and seeing if it makes a difference. I.E. a headlight short feeding back through the systemj...also, separately disconnect the tail light switch and see if you have any improvement...same problem, a short feeding back through the system. I am impressed at the work you have accomplished and how you have kept track of it...A third possibility would be the little mount many of us have on the side of the starter with the fuse in it...those mounts can vibrate so much that the swedges become loose and cause a vibration short as well...Good Luck...Ernie in Arizona