Negative or positive doesn't matter except for the breakaway reason listed above. Most all heavy equipment manufacturers break the negative path, my guess is to make servicing the switch and it's cabling safer. I suppose it also helps switch location as generally the positive wire is being routed in the opposite direction of the negative.
In a DC system there is no difference when it comes to loads, if the negative (not ground)is disconnected and you touch the positive cable to the frame nothing will happen as there is no path for electrons to flow to the negative, "ground" doesn't apply to DC circuits there must be a path to the negative.
In an AC system where the "hot" is created in reference to the "neutral" and the electrons are trying to get back there, dropping a neutral in a AC system will likely destroy the electronic element of many devices, not so in DC circuits.
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Hoping to be a proud owner of a
Kodiak 292 TQB soon.
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