There are 12v generators, but alternators are far more common on conversions. The presence fo an alternator would be a dead giveaway of a 12v conversion.
If you have a battery ignition (as opposed to a magneto) ou might look over your coil to see if it indicates that it's a 12v, but that wouldn't be as sure as the alternator. Some cois are built to step down internally, from 12v to the 6v to the points. Others require an externalresitor to step the voltage down beforeit gets to the coil. If you trace back the wire leading into your coild from the battery end and find a resitor in it somewhere, that would be another sign that it is 12v.
As far as the hard turning, I'd hazard that you have a poor connection somewhere. Shiny and bright is the rule for all terminals, lugs and connections. Make sure you'e got good connections at the battery terminals. It's a good idea to cleanup around where the ground cable bolts to the chassis -- clean the underside of the bolthead to mare metal, as well as a small area under the lug on the cable. Metal to metal is what you want -- paint is a poor conductor.
Apart from that, you could have poor or inadequate cables. If you detect objectionable heat anywhere along the cables after cranking, that would be the place to look for corrosion of your cable ( most common near the battery terminals)or a poor connection
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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