if you can hear the arcing, my experience has been it is probably not the vehicle electrical (6 or 12v) but ignition. Sounds like you are on the right track with what you did on the dist cap etc. Another trick is to look under the hood at night (darker the better). The arcing you hear should show up at in the dark! (I have found some bad plug wires that way, or the coil wire as well!)


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof