Also George until 1965-67 the Brits (and other European countries) used the 6 volt positive ground system (electricity actually flows from negative to positive) which was a nightmare to own and work on. The 12 volt negative ground system was reluctantly adopted to facilitate 'modern' electronics such as stereo equipment and accessories (LED lights, cigarette lighters etc). Ford and Chrysler used the 6 volt positive ground system until about 1956. A positive ground system reduces corrosion (rust) as researched by Telecom industries.
As a teenager in the late 60's my pride and joy was a 1963 Austin Healy 3000 MKII BJ7 ... a definite chick magnet and fun to drive but sorting out wiring problems was a challenge. On the + side, they were cheap because of the positive ground.
