The TO30 is still a 6 volt and I found that using the heaviest (gage) battery cables that I can find and an extra ground wire to one of the starter mounting bolts makes the starter crank better. The TO 30 is positive ground. This tractor actually belongs to an 88 year old WW II vet that is a neighbor - He and his family all say the tractor is mine since I have rescued it and got it running. The first time I saw this tractor - JR (the neighbor) asked me to help him push it into the woods so it would be out of the way. I towed it home with my Ventrac and it is now in working order and we have used it to do some bush hogging and other work around his place.