Bill........while there is an obscure advantage to positive (+) ground, negative ground (-) came about because of 12-volt ALTERNATORS. The alternator is an ALTERNATING CURRENT device that needs to be changed to DIRECT CURRENT by 1-way valves called DIODES to charge a BATTERY. The outer case of the diode is NEGATIVE but needs a HEAT SINK to keeper COOL so the silicon doesn't melt. The case of the alternator acts as an HEAT SINK. While you kenn "insulate" the alternator case from the engine block that is generally a non-starter 'cuz its EXPENSIVE. Wanna blow yer mind? Consider the FIBERGLASS CORVETTE. Bottom line, "earth" (or ground) kenn be positive (+) and negative (-) at the same time. Ain't electrons funny???........electrical Dell, FCC 1st Class License and retired Boeing Flt Test Engr
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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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