Posted by greyfoxxca on November 27, 2010 at 09:29:40 from (137.186.159.24):
well I cannot leave well enough alone
what about positive and negative polarity? what works better for old tractors?
well I have found the following
There is no strict answer as to "why" American cars are ground based systems. Rumors are that it was because of Benjamin Franklin"s guess to the "poles" of electricity as to which way current actually flowed, and degenerate into derogatory comments about american"s ignoring the laws of physics. The convention for labeling batteries, despite physics, remains however. Despite any claim to the contrary DC Current ALWAYS travels from the ground (-) side of a battery to the positive (+) side; because electricity is made up of free electrons that accumulate on that side of the plate as a result of a chemical reaction. Also, all switches (except immersed switches - no arc switches used for explosive gas environments) will "arc" when the contact is almost made. Also, production prices between positive and negative chassis systems are no different as electrical systems are the same in concept as well as production. There is no "requirement" that one system have a master switch (or any switch for that matter) because of its ground source. It is true however that most of these positive systems use better wiring, and relays for current load where american cars rely on the switch itself to handle the current load; which increases the cost and complexity of the system (Lucas prince of darkness, Jaguar comes to mind). Lastly, Ground based chassis systems have one inherent problem not normally seen on a Positive chassis system; known as a ground loop. A "ground Loop" is properly stated as an electron potential imbalance; where there are more electron"s available in one point of the car as opposed to another point in the car / this is eliminated in positive based systems and compensated for in negative systems by running ground straps through the chassis.
that is correct the current flow is from the negative to the positive terminals.
the bottom line in what I ferreted out is in a negative ground system the entire car(tractor) is charged full time. When you turn something on you are completing the ground circuit.
In a positive system you are turning on the power to the item being started.
negative ground advantages seem to be less corrosion on the body of the vehicle as it is under battery voltage at all times.(cathodic protection) disavantages The feeling is that the battery will discharge faster than a positive ground system.
Also the electrical wiring corrode faster because of the same reason. Now some believe the opposite is true about the wiring.
Now the positive ground advantages some people believe the positive ground systems the switches when turned on or off do not spark(as much) like negative ground systems. This would lead to longer points life.
less corrosion on the wiring as well as less battery draw down when out of use.
i would also guess you would want the electron flow in the spark plugs from the electrode to the block. From the block to the plug would increase the possibility of plug failure to carbon build up. The electrode runs much hotter and is usually cleaner than the outside.
anyone has experiences to confirm or deny these theories?
At this point when switching to 12 volt with an old 6 volt positive ground generator I will be staying at positive ground.
When boosting stay positive to positive and negative to negative on the batteries. Leave the frame connection stuff out.
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