</font><font color="blue" class="small">( Oh and what about the starter? Still work after the 12 volt conversion?...any other issues? )</font>
The kit you saw at ytmag will probably work if it's the one for the late model 8N that does not include a coil. The biggest problem you will have is getting your alternator pulley and tension adjuster arm modified for the alternator. I took the pulley off my generator and mounted it on the alternator (if I remember correctly). Of course your voltage regulator comes out or you can just disconnect it and leave it in place.
The kit I saw at ytmag comes with a
ballast resistor. This kit expects you to keep the 6V coil and for that you will need the ballast resistor or you will burn up the coil and points. If you get a regular 12V coil, you will not need the ballast resistor.
When you put the new battery in, it will most likely be 12V negative ground. Even though this is opposite to the 6V battery, your starter doesn't care. It will still turn the correct direction. The easiest way to explain it is to just tell you it's "magic." /forums/images/graemlins/wink.gif
One thing you may need after awhile is a new starter solenoid. My old 6V one fried after a couple of years. As a matter of fact, the engine started and the starter kept going after I released the starter button. I had to disconnect the starter in a hurry to get it to stop turning because the solenoid welded together. Some will say that with 12 volts, you don't pull as much current as with 6V, but the starter turns over faster and the power dissipated (volts x current) is higher for the 12 volt system.
If you can find a kit for the NAA or later tractors, you will be a lot better off than buying one for an 8N and modifying it. I just bought all the parts and put mine together. If you have a local starter-generator shop, they might offer you lots of help. My local guy had done lots of 12V conversions and had almost all the parts needed in stock. Many New Holland dealers also have a 1-wire alternator conversion kit they sell. There's no need to experiment if you will spend a little time and check around. /forums/images/graemlins/cool.gif