Sorry this is long, but this needs some details to be able to work through it properly. Well hopefully I get a little help or nod of approval from some Ford guys that the information I give here is correct. I am not a Ford guy never been around them still trying to learn some of there oddities. The connections of your alternator output to the ignition switch gets the job done but it NOT correct. In fact depending on how they wired it you may even have some melting insulation up under the dash where too much current was feeding through wiring. Check the wiring between the ignition switch and the ammeter that is where too much current ..amps.. may have been passing. Now here is the part I am still learning on. I am attaching a wiring diagram that I believe is correct, see 1st link. I am referring to the second diagram on that page named ..12 Volt Conversion.. In the upper center it shows a ..terminal block.. the bottom center terminal of that is the suggested connection where the Alternator output wire should go. There is a possibility your tractor was wires without this. That block is an original part which is one of the Ford oddities I recently learned about. This site offers that part, see 2nd link. I say it is an oddity because very few original 6 volt systems used resistors but apparently these did and they are said to be 0.5 ohms. Also another place I am not certain what correctly applies to the different models but in stock form I believe your tractor would have a ..front mount 6 volt coil.. If so when converting to 12 volts your ignition power needs to come from the switch through the .5 ohm resistor on the terminal block and then again in series through the 1.6 ohm ballast resistor and then to the coil. All this is shown on the diagram. I also do not know exactly how that terminal block mounts it appears that it may be made of an insulating fiber board and use some counter sunk head screws for mounting. If you go to the YT parts from the big ..Tractor Parts.. square at the top of the page and navigate down to the 2N electrical section you will see there is another more expensive terminal block sold by them and it shows the mount hardware with it. If you did not have this block before I said earlier the alternator is suggested to connect there. I personally would run the alternator output wire up to the right side terminal of the ammeter as shown on the diagram. Defining which terminal is the actual correct one to connect to on your tractor left..right etc. can be done by placing it on the ..opposite.. terminal of the one that is going to battery power. There may be, in fact it is likely, there will be multiple wires on that terminal. Without the ..terminal block.. that amp gauge terminal could be the connection place for the ignition switch and the light power feed. Doing it this way eliminates the extra connections made by use of the ..terminal block.. I know this deviation from the diagram complicates the finished product but I personally think it is the best method if you are not looking for originality, that goes out the window when you change it to 12 volts. I should add that the alt. output feed wire to the ammeter should be 10 gauge as should the wire that connects to the opposite side of the ammeter that goes to pick up battery power which will be from the solenoid stud where the positive battery cable connects. I hope this cures your problem. I also hope other Ford guys stop by and add any needed corrections or comments.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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