In this video, I answer the question of why positive ground was used on old cars, trucks and tractors. Furthermore, I speculate on why negative ground is used today. At the end of the video, I answer some questions and offer some helpful hints. And, you don't need a degree in Electrical Engineering to follow along.
For those of you who do not want to watch the entire video, I attempt to get to the answer immediately right at the beginning of the video. Then, I go into a deeper dive.