Strange thing is that whatever these do, can't be necessary for starting as it worked fine without them connected. I think they might be an earth but the only earth marked on the diagram is the negative battery lead to the engine body. I think I have seen a pic of a starter with an earth strap from that position on a starter.
The tractor did have battery drain problems if left overnight and these wires are badly cracked.
I'm wondering if they were an afterthought earthing which was disconnected later on.
Thing is I've got a car mechanic to agree to come over to help with the wiring and I guess he won't know as he doesnt usually work on tractors (best I could get).
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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