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Old 08-30-2013, 01:42 PM   #21
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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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Old 04-02-2014, 04:16 AM   #22
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Honestly it depends on which theory you are thinking of. Conventional current flow or electron flow. Conventional being positive to negative and electron being opposite. Bottom line it is 12 volt dc. There is many chassis grounded items that can exist. Switch the positive.
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Old 04-02-2014, 05:47 PM   #23
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As I understand these systems breaking the negative or positive isn't going to make that much difference. Both will prevent the battery from draining down as fast over the winter. The problem as I see it is if you forget to switch it back on when you pull out you will have no break away system on the brakes. The tow unit will power the brakes while your driving but if the trailer becomes disconnected there will be no power (battery in the trailer disconnected) to activate the brakes from the break away switch.
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