I have a grasshopper 720K and i have to boost it with the charger each time to start it, i put a voltage meter at the battery and it shows it is charging low, about 11 - 12 volt. The only way that the starter will spin fast enough to start the motor is if i have the charger set on boost otherwise it turns very slow as if the battery is weak, i've taken the barrey in and had it check and it comes back fine????? been told there is a bad ground?? checked everything and repairs some worn wires but still have the problem, Is there a voltage reg. or a part that could be bad that would cause this to not charge the battery?? and if so what are the chances that this too would be the starting problem