The voltage drop starts at the switch then to saftey neutral switches---wire harness connectors---buy the time it gets to the starter it is low---you did the most cost effective way of solving the problem. The high temperatures incurred on the 4.3 in that enviroment does'nt help much either.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.