A little knowledge can be a dangerous thing, but here goes anyway. The way I see things, the change to 12 volt batteries & high tech accessories happened close to the same time, not by plan, but by coincidence. Early 12 volt autos still had tube type radios etc, so could be either polarity. By nature of the beasts, transisters & high capacity diodes use the neg pole as the heat sink contact. It is an electronics industry standard. With the addition of more electronics it was more economical to make the vehicle polarity to match. Also makes sense to have that big aluminum, exposed to the air, heat sink at the same potential as all the metal parts nearby. IIRC, Mr Kettering, the guy that invented coil/points ignition decided to run GM cars at neg ground. That"s my story & I"m sticking to it, unless someone can show me I"m wrong again. Willie
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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