James, Im definitely with Old on this one, Ive seen 6 volt batteries blow up when jumped with a 12 volt battery and can NOT recommend this course of action, i.e. do it at your own risk!!!!! !!! Im NOT saying it doesnt work and hasnt been done mind you, Im ONLY warning you it can be dangerous! That being said, if you do jump its still + to + and - to - concerning the batterys regardless whichever battery post happens to be connected to the huge hunk of tractor iron. If you did jump say a negative ground truck to a positive grounded tractor (still + to + and - to -) dont let the truck and tractor iron frames come into contact with each other. Nowwwww w as far as jumping to start a 6 volt tractor with another 12 volt battery, the safer way to do it is jump the STARTER ONLY that way ONLY the starter gets 12 volts NOT the 6 volt battery. To do that attach the - of the jumper battery direct to the starter post (if you can get to it) that would be the downstream (to starter NOT to battery cable) side of a starter switch or solenoid,,,,, ,and then when youre ready for the starter to spin attach the other jumper cable thats hooked to the + terminal on the jump battery to a clean non paint non rust frame ground on the tractor near to the starter and AWAY from the tractor battery cuz there can be some serious sparks going on. Soon as she starts remove the cables..... .. USE CAUTION AS THESE ARE HIGH CURRENT POTENTIALLY ARCING N SPARKING JUMP CONNECTIONS Best wishes, John T
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