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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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