Most likely 12 volt negative ground.
If a pre 1960's it could be 6 volt positive ground.
Usually 6v, can be 12v.
Yes it can.
Usually 12 volt negative ground.
If it is a model from the last fifty years it is a 12 volts battery.
It should be 12 volt.
If both batteries are of the same voltage (12 or 6) yes, you can use the charger. make sure that they are of the same voltage.
You will need a voltmeter. Hook the red cable to the + post and the black cable to the - post and it will show the voltage.
Although it really depends on the model, most are 12V.Do You Have The Old battery how many cells does it have,most 6volts have 3cells and 12volts have 6.It all depend on the tractor some use a motorcycle battery.
Have you checked for a voltage draw on the battery when the key is in the off position. Also make sure the Alternator is charging.
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There is a plate behind the battery and before the fuel tank, where the voltage regulator should be bolted. It is a small, metal rectangular box, with four wires coming from it.
no