Bought a d10 awhile back and finally got it home. Previous owner removed battery and couldn't remember whether it was 6v or 12v. Service manual that I bought from Tractor Supply says tractor could be either depending on year made. Does anyone know how to determine if this thing is 6v or 12v? It still has the gen/volt regulator, so it has not been converted to alternator. Also, is it positive or negative ground? Cables are generic affair that could go on either post, since previous owner spread the connectors wide open to remove battery. Where is seriel number to determine what year made? Thanks!