@@ca58xykt Many older British cars were built to be positive ground. Later, for a variety of reasons, many of those cars were converted to negative ground.
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@@ca58xykt All British vehicles imported to the U.S. after World-War-II were positive ground, and many stayed that way until the 1960's. Jaguar cars switched over in 1965. The MGB coupe and roadster were positive ground until 1967.