"If I hook up a large deep cycle and fully charged battery to this tractors battery....will the charge ( or some portion of the charge) transfer to the tractor battery and keep it partially charged and safe from freezing?"
1) NOPE I don't envision the deep cycle battery (just sitting there at around 12.6 volts subject to state of charge and temperature) "CHARGING" the tractor battery (also around 12.6 volts). If you add more battery amp hours (say add batteries in parallel as youre talking) you have more stored energy, but that's NOT necessarily one "charging" the other.
2) I don't see the deep cycle battery keeping the other from freezing if the charge state becomes depleted.
I would consider the use of a small solar charger and charge controller to keep the battery charged.
Even a perfectly otherwise good battery eventually self discharges over time due to chemical action.
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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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