It's a pretty sure bet the B terminal will be power from the battery.
Put one lead of your meter on the B terminal, start turning the switch and see what terminals connect in each position.
I would not ground the G terminal! No reason to ground any terminal of an ignition switch. Good chance the G terminal is for glow plugs if it were used on a diesel. If so, and you ground it, it will short the battery terminal when the switch is in the G position.
If you are going to use a fuse, only need to fuse the feed to the B terminal. If you use an inline fuse holder, choose a heavy duty one, or go with a spade type fuse holder with a cover. The spring type inline holders tend to be loose and don't like the vibration and rough service of a tractor.
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Today's Featured Article - Weldin Basics, Part 3 - by Curtis von Fange. Oxy-acetylene Welding - Part One In our series on welding we have taken a brief look at AC and DC arc welding along with basic techniques and safety equipment required for safe usage. Since our premise is to cover welding types that might best be used on a farm environment we have kept our overview purposefully simple and general. The second type of welding that this observer finds quite useful in
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