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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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