Hi, I have a Fiat 411R tractor, It is a 24 volt system using two 12 volt batterys..I went to start it as normal and smoke came out the starter motor, the engine turned over very slowly two turns at the same time...I stopped cranking the engine and after a few minutes i tried again and the same thing happened..I removed the two batterys and checked them both for charge, both were showing down a little so i charged them on my trickle charger,, After i put the batterys back in place, i tried to start the tractor but the same thing as above happened again...I am wondering two things, does it sound like i need to replace the starter motor ( around the $650 mark here in AUSTRALIA) and 2nd question is what is involved to changing the 24 volt system to 12 volts...