Interesting article on polarity- - - -the guy has obviously never worked on a MOPAR ignition system from the late 1940's or early 50's. Those engines were notoriously difficult to start, especially in cold, humid weather, but only some of them. After years of trying every tuning trick in the book, the cause was finally discovered- - - -coil polarity. Apparently, the manufacturer they were using to supply their coils was not paying attention to which side of the primary winding the low voltage end of the secondary winding was attached. That created a situation where some of the coils were firing the spark plugs from the "cold" side of the electrode, which takes approximately 20% more voltage to jump the gap. On a cold start with slow cranking speed, some of those Dodges, Plymouths, Chryslers, and DeSotos just didn't want to start! GMC small trucks were sold with a positive ground electrical system to be consistent with the industry standard for the big rigs they also manufactured- - - - -positive ground all the way to huge tractor-trailers and all sorts of offroad construction equipment. The reason for that being done would require another several paragraphs, and my fingers are tired!
Jerry
