"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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