Besides disconnecting the battery, I Vise-Grip the (+) and (-) cables together, thus preventing voltage spikes in the "ungrounded" side of the system.
IMHO, just disconnecting the battery is WORSE than leaving it connected, as the battery itself would absorb voltage spikes at lot better than just leaving the system "open".
I can't remember the exact source, but I first learned of this in a manufacturer's instruction sheet, IIRC from a major truck builder's instruction sheet for truck accessory installers.
Makes sense to me, so I've been doing it for YEARS with ZERO problems.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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