You ask "he installed a 12 volt battery, negative ground, but did not make any other changes. What may I expect to be damaged because of this?
If all he did was install a 12 volt battery into a 6 volt tractor (if that's what it was??) but it never started:
1) If 12 volts was applied to an old 6 volt voltage regulator (if that's what it had???) for a long enough time period it could possibly be damaged.
2) If polarity were reversed (Pos to Neg ground if that's what it was???) and the generator never got correctly polarized, again that can damage a voltage regulator
3) 12 volts on an old 6 volt coil (IF thats what it had and assuming no ballast was added) can overheat and damage it given enough time, but if it never started it may well be okay.
4) 12 volts on a 6 volt coil can eventually cause premature points burning if the ignition was left on long enough. (true for even correct voltage ign on long time not running)
5) Of course if 12 volts was applied to any 6 volt lights (if it had such) they will glow very bright a short time then burn out
If its a 6 volt tractor and has a 6 volt coil you can easily add an external series voltage dropping (12 to 6) ballast resistor (or else toss the old coil and get a new full true 12 volt coil),,,,,,,, get a 12 volt voltage regulator to match the tractors ground,,,,,,,,,,get a 12 volt generator,,,,,,,,,polarize the generator to match the ground,,,,,,,,,,,,,,get 12 volt lights,,,,,,,,,if it has an ammeter and polarity got swapped its leads need reversed,,,,,,,,,,,,,wire coil to match tractors polarity. NOTE I have used 6 volt gennys on a 12 volt system and only changed the VR and it worked
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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