You can do A LOT of damage or NO damage, it depends on how you jump start it.
DO NOT DIRECT JUMP A 12 VOLT BATTERY TO A 6 VOLT BATTERY ESPECIALLY WITH CONNECTIONS MADE N BROKE AT THE BATTERY TOP WHERE EXPLOSIVE GASSES CAN BE PRESENT
A much safer way to jump start a 6 volt tractor is to jump direct to the big stud on the starter itself because thats NOT a connection to the tractor battery because the starter switch (when not activated) is an open circuit. That way the ONLY thing your applying 12 votls to is the starter motor. When you apply 12 volts to the starter (it ONLY for safety) she should reallyyyyyyy spin over fast so if the ignition is on and works thats a safer way to 12 volt jump a 6 volt tractor.
NOTE if its a working magneto ignition that can start the tractor even if the tractor battery is dead or not installed HOWEVER if its a battery powered coil distributor ignition it needs energy to run so the 6 volt tractor battery has to have at least some charge remaining
SUMMARY jump to the starter ONLY and even if it still turns the same direction regardless of battery polarity, I still use the same jumper polarity as the tractor i.e. Pos or Neg ground. If its Pos ground I make the first - connection to the starter stud/post then to start it I make the last + connection to the iron frame close to the starter and not close to the battery.
Nuff said, if I missed anything the other fine gents can add to this.
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