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If it is still in the tractor hooked up unhook it and try charging it if it still won't charge the battery is probably bad. If it does charge out of the tractor you might have a short in your wiring on the tractor. Hope this helps.
I usually do over night.
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.
6volts 2amps for 6 volt battery, and 12 volts 6amps for a 12 volt battery. Don't charge a 6 volt battery on the 12 volt setting or it will explode!!!!!!!!! you're ok going the other way though.
battery
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.
The battery has a charge unit instead of being itself a unit. A battery is not a unit. The unit for the electric charge is milliampere-hour.
Try checking the pick up coil or the magnets on inside of the flywheel.
Typically a charger is not meant ot "jump start" and engine. It provides a slow, regulated charge to the battery. A car battery or fully charged battery will typically provide enough pwoer to jump start your tractor. I recommend charging your battery for a number of hours (or overnight) till completely recharged. If the tractor will no start without a jump, your battery may be in need of replacement.
A battery contains a charge of electrons. When these electrons leave the battery and travel through a circuit that is described as current.
The settings on your battery charger may vary the charge voltage (e.g. 6V and 12V) or the charge rate (e.g. 2A and 6A). Because you say that your charger has three settings, I would guess that either the charge voltage is fixed at 12V (and you have 3 choices for charge rate) or you have one setting for 6V and two choices for charge rate at 12V. Make sure the voltage is set to the markings on your battery. This is most likely 12V, but it's best to make sure. If you can't match the setting (you have a 12V only charger and your battery is 6V), you must use another charger or you are likely to damage the battery and to risk explosion. The charge rate setting is meant to allow you to charge batteries of different sizes. A lawn tractor battery probably should be set at the lowest charge rate, say 2A. Larger batteries, like the one in your car, can be charged at higher rates. Charging at a low rate prevents the build-up of heat in the battery and reduces the risk of damage.
Unless it is a rechargeable battery you cannot charge a dry charge battery. If it is rechargeable you need to purchase a charger for that size battery. Automobile batteries are not dry charge.