I think it's wives tale too. I've never disconnected the battery, and never had a problem.
I think it would be possible to damage electronics under some conditions, like grounding the body and welding the frame, or grounding the frame and welding the exhaust system. Either way would send welding current through the chassis ground, which could send some weird feedback through sensitive components, maybe... Under that condition "possibly" the battery could serve as a conductor, but I'm still not sure.
Here's another thought... If it is possible to damage electronics with a welder, what about electrical storms? What about electromagnetic fields, as in driving under high power lines? Or driving through a tunnel with high voltage lines?
There has to be some safeguard against such sensitive failure. Think of the liability if computer controlled throttle suddenly lost it's mind!
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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