Posted by rvirgil_KS on September 03, 2014 at 21:56:34 from (50.93.233.149):
In Reply to: Positive ground posted by 37Chief on September 03, 2014 at 21:15:04:
Positive ground was quite common in vehicles up until mid 1950's and in tractors up into the 1960's.
Probably a number of reasons. Politics, be different from competitor, or "just because". The primary scientific reason at the time was belief that positive ground had less corrosion of the terminals, but improved wiring has made that a non issue today.
Negative ground became the standard in about 1956 with the majority of manufactures going to 12 volt systems and partly because developers of a new invention called the transistor radio seemed to prefer negative ground.
There is nothing mysterious about positive ground. Positive and negative ground is like right hand and left hand threads on a bolt. With bolts the nuts screw on in opposite directions, with positive and negative ground current flows through the circuit in opposite directions. Some electrical devices are polarity sensitive, meaning that current flows through them in a certain direction such as ignition coils, ammeters, charging systems, and some gauges.
Most polarity sensitive devices can work with either ground configuration provided they are properly connected in the circuit.
Starters turn the same direction regardless of battery polarity.
Positive ground does not seem right to you because manufacturers have not used it in over 50 years.
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