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Mornin Steve, I was just headed for the Dentist ouchhhhh hhhhh lol so only have a sec. I didnt look at any of my schematics, and can just speculate, but if I recall, LP Gas is heavier than air and perhaps there are additional safety concerns that a LP leak could allow expolsive gas to settle in an area of the tractor and explode if a spark (caused by hot wires arcing to ground) were introduced. Fuse elements, of course, will burn into inside their glass housings (wont spark to outside) should their current ratign be exceeded, and that kills the source of power to a shorted wire down the line which prevents any further sparking possibly in areas of collected LP gas. In gas tractors, while gas fumes are explosive (especially if contained and under presure), they dissipate in general areas and are less likely to settle in a low spot. In non fused circuits, properly sized wire itslef acts like a fuse element and eventually burns into, and while this may not be as safe as an actual protective fuse, theres less hazards in a gas than a LP tractor is my best guess. Hopefully, some LP gas experts can shed more light on your question, but my best short answer guess is LP gas is more hazardous, therefore, additional safety features (fuses) were used. God Bless the USA John T Nordhoff
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