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You posted: "The only reason I can think of for someone to disconnect a battery cable is a serious problem in the charging circuit that they do not know how to fix or do not have the time to fix, like a bad v/r or other short which drains the battery. There is no reason other than that to disconnect a cable." I don't think disconnecting batteries on stuff left sitting around is a BAD idea! Even with newer stuff, in tip-top shape, I often take off a battery cable if it's going to be stored for a while. (You just NEVER know.) The newer stuff has a considerable parasitic drain from the electronics, as well. You NEVER know when some vermin may come along and decide to munch on the wiring, or some freak thing will happen to short and cause a fire, or even cause the starter to begin cranking the engine, for some freak reason. I have seen BOTH scenarios a few times, over the years. One time, my late Uncle, and electrician, was working alone at a remote location, and was startled to see his Econoline van ("three on the tree tranny") chugging across the parking area powered by the starter! We never did figure out what had initiated the problem, but by the time he got the battery cover off (under the seat) and disconnected the battery, the battery, the starter, and the main wiring harness were all burnt beyond use. I ahve a battery disconnect switch on a couple of pieces of my equipment, as well, just for safety.
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