Jump starting tractors

[etpm]

ok but at no point is there a disconnected battery in the system, this is my issue here. the sink would just go to the now seperated battery.

As you might recall I said that disconnecting the low battery MAY cause a voltage spike, not WILL cause one, that could damage stuff in the jumping vehicle. The good battery can only absorb a voltage spike so fast, so the vehicle doing the jumping could be damaged. Remember, the jumping vehicle's alternator will be charging two batteries, one of which could be accepting current at the max the jumping vehicle's alternator can put out. The jumped vehicle, in this case a tractor, should not, as near as I can tell, be at any risk. I did not mean to imply that jumping is likely to damage anything, I just said it could. And then provided a link that explains why it could. I suppose if the jumped vehicle has a bad alternator this risk would be higher because of the larger load dump. But if it was good and charging correctly then the load dump, if any, would be quite small. Perhaps the safest thing would be to charge the low battery for several minutes with the jumper cables then turn off the engine, then try starting the tractor.
Eric