The reason MECHANICAL "vibrating contact" regulators are SOMETIMES polarity-sensitive is the material(s) the contact points are made of.
MANY of the regulators I've seen these later years are NOT marked as to a specific polarity.
To save money, sometimes only one contact point of each pair is made out of "the good stuff" corresponding to polarity. In other words the upper contact in a regulator intended for (-) ground or the lower contact in the same type of regulator intended for (+) might be the most likely to erode and pit, so it's made of better stuff. (What the "better stuff" is, I don't know, copper/silver/tungsten maybe?)
If you use the regulator on the polarity opposite of the one it was intended, it WILL work, at least for a while, but contact wear will be more rapid.
Of course, ELECTRONIC VR's are a different matter and, likely, all the smoke will be let out if connected to the wrong polarity.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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