Re: Farmall wiring diagrams - back on line

Posted by JesseH on May 29, 2003 at 08:32:22 from (167.142.225.242):

In Reply to: Farmall wiring diagrams - back on line posted by Bob M on January 15, 2002 at 18:32:48:

Bob, It seems you have vast knowledge on this so share some with me if you can. My Farmall M has 12 volt on it and the diagram of the wiring is similiar to your 12v alternator w/magneto key switch and push to stop switch is the closest. The problem arose when it stopped charging. My alternator has a 2 wire plug and the battery terminal on it. The 2 wire plug was run to a black box (about 2x3 inches)and connected to the 1 & 2 post(it has 4). I have taken out the run to the black box and rerouted one to the battery and one to the switch (on/off)(This is how my dad's M was run). Now the unit charges but the amp gauge is pegging out at around 20 + amps. I would guess if the box is a magneto box that the alternator has a voltage regulator built in. There was no ballast resistor on it so I installed one but that caused the tractor to miss. I guessed then that the coil is 12 volt and I was only sending 6 volts to it. I guess my question is what is the magneto used for and is the amperage too high. Also could the black box have been a voltage regulator instead of a magneto? Any help from anyone would be greatly appreciated. Keep up the good work!

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