I think I can see one possibility, through a ground loop. Often see systems with multiple major ground points, in multiple places. There's more than 0 volts potential between those ground points even on a factory fresh setup, and only gets worse as rust & other corrosion gets in the way. From what I've understood, the systems are generally designed & tested to be tolerant of these somewhat floating ground levels (another post below talks about the testing). Under admittedly rare conditions I could see an unpowered but still-grounded device being caught in the welding loop path and seeing voltage potentials beyond 12-14V, and/or in a reverse voltage configuration. This also fits with the rule of thumb that, if you have to weld on a newer vehicle, keep a good welding ground point as close as possible to weld point - it would help keep the welding loop as small as possible. Like others, have never had a problem but the cost of diagnosing and replacing the black boxes keeps the pucker factor there.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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