Posted by Gerald J. on December 22, 2008 at 11:15:36 from (4.254.65.140):
In Reply to: positive ground posted by larry cook on December 22, 2008 at 10:54:20:
It works just as good as negative ground, not much better, not worse. Lots of 6 volt vehicles were positive ground. Nothing really odd about it, just doesn't fit the thinking using solid state NPN transistors. Edison's DC power systems used 110 volts + on one side of the line, and 110 volts negative on the other side. And with wound field motors and lights it doesn't matter what the polarity is. Deere 24 diesel tractors of the 50s and 60s used split 24 volt systems that gave on 12 volt positive ground system and one 12 volt negative ground system. And they worked, still work except for those who can't fathom them and mess them up.
Alternators are very picky about polarity, radios are very picky about polarity. But both have been made with adjustable polarity. Generators and lights are not, so long as the generator is polarized to make it build in the right polarity to match the battery.
Ignition coils are a little picky about polarity, having the right polarity gets a bit better ignition in difficult conditions.
The biggest arguments about polarity concerned corrosion at ground connections, but they are opposite for the battery cable while charging and while starting, and opposite between the battery cable and the starter and generator mounting.
Fact is, Ben Franklin guessed at the polarity of electrons (that he didn't know about) and we have been stuck with that polarity definition. Had he guessed the other way, our positive ground would be negative ground and either way would STILL work. Just you have to keep the polarity in mind when hooking up some stuff.
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