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Ron..... ..If you can understand simple wiring diagrams, here is a link to one that works. Thanks to Neil. There is no transformers converting 6 volts to 12 volts and visa versa 12 volts to 6 volts. Transformers only work on AC (alternating current) not batterys which are called DC (direct current). Alternators require negative grounded 12 volt batterys, its the built-in transistor regulators and diodes, solid state stuff. If your conversion was done correctly, you should have a 12 volt negative ground battery. Remember the 8N originally had a 6 volt positive grounded battery. You have to keep your head on straight. "Can a single terminal alternator be put a tractor that uses positive grounding?" NO....because the single terminal is positive 12 volts and the alternator case is the negative 12 volts terminal which is connected thru the engine block to the battery negative terminal by the ground cable. If you were to connect the alternator single terminal to ground, you would short out the alternator and burn it up and you would have to buy a new alternator. SO DON'T GROUND THE ALTERNATOR's SINGLE TERMINAL!!! Generally, the alternator's single terminal is wired thru the amp meter to the battery positive connection. It is generally connected down at the starter battery terminal for convience. But you can hook it anywhere you find convient, direct to the battery....or.... You need to understand alternator wiring schemes. The big heavy screw stud is 12 volt power out. There are two other connections, P1 which needs a switched 12 volt source to keep the alternator from feeding back into the ignition coil so you can turn the engine off. That is what the dash light/marker light does. It also acts as an "idiot light" just like in your car when the light lights up, the alternator is not charging/engine not running. Some times the convertor uses a diode (which is a 1-way switch) to disconnect the alternator from the ignition coil. Same effect, same reason. I personally like using an idiot light scheme because unless you are an electonics engineer, its hard to determine which way to connect the diode to make it work correctly. P2 is called the battery "sense" line that electrically tells the voltage regulator what the battery voltage is, kind of neat if your battery is in the trunk of your tractor and you have a voltage loss from the long wires, but in this case the simplest thing, since the battery is so close, is to directly connect the "sense" to the alternator output (which goes to the battery anyway) There is an optional voltage regulator that can be installed inside the alternator that does away with the need for any other external wiring to P1 and P2....BUT....you have to jazz your engine to high RPM's to get the alternator to start charging. Thats ok for automobile engines that rev to 5000+ RPM, but your N-Tractor engine is redlined at 2200 RPM and idles at 400 RPM. I really don't like to jazz my engine that much, and altho just 1 wire seem like a neat way to go, it is not my favorite or recommended way to convert. But you can if you want to. The best part about converting to 12 volts is the way the starter winds up, and the engine starts so much eazier. BTW starter don't care positive ground, negative ground, still turns the engine the correct direction. Since you were able to start your engine, will assume therefore that the ignition system has been converted correctly and I therefore will not discuss the various ways that problem is delt with. Sorry for the lenght of the post, but trying to explain the 12 volt conversion requires some understanding of electricity. Its rather simple and straight foward if you do and if you don't, you can be in over your head. So if in doubt, draw a picture of where all the wires go and understand why they go where they go, keeps your head on straight and think about what you are trying to do. Hope this helps..... ....Dell
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