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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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