Robby..... ....don't know if anyone satisfactorily answered your question....."I'm guessing 12 volt must be better since all cars and trucks are now 12 volt".....Yeah, butt.....Why did they stop a 12 volts? Military was already using 28 volts, mostly for tube radio equipment, but starting airplane and tank engines too. In early 50's Detroit started producing hi-compression V-8's as a response to consumer demand for MORE HORSEPOWER. HP sold cars. Hard to start didn't sell cars. It was quite cost effective to make a 12 volt battery (2 small 6 volt battery in bigger case). Then the automotive consumer told Detroit, if you want to sell me a new car, its also gotta have airconditioning, power window, power seats, 500 watts of radio amps, eyeblinding headlights for safer driving on lit freeways. All this takes ELECTRICAL POWER. Today's automotive electrical designers are actually talking 36 and 42 volts for future car requirements. You know, computerized everything. Maybe the question should be asked why 6 volts? Turns out that in developing the electrical starter (for lady drivers) in 1915's, 6 volts was the smallest/cheapest battery that could reliably start the low compression engines. Thats why 6 volts. So in 1939, when Henry Ford designed the 9N tractor, he just got a 6 volt starter off his automotive assembly line. And why not, its addequate, already invented, and cheaper than designing a new starter. One thing Ford did different on the N-Engine, was put the starter on the leftside of the engine, where it is eazy to get to. Instead of on the rightside (like his V-8's), hidden behind the hot exhaust..... .....Dell
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