Posted by Horse-George on February 03, 2008 at 22:55:05 from (204.73.103.253):
This message is a reply to an archived post by Bob on October 22, 2007 at 19:25:07. The original subject was "WOW... Lets get this fixed".
Hello
I just looked at this page and found a partial answer to my question, which I posted a short while ago. From your photo, I can see I have three options, a resistor, a bulb, or a diode going to the alternator exciter terminal. After seeing what you posted, I think the original plug that came with my Farmall H must have had the diode. It was molded onto the top of the alternator pigtail plug, and embedded in some sort of rubberized material. Because of this I was unable to see what it was. It burned out and I thought I needed a resistor.
In my post, I mentioned that I have been using a bulb on the side of the engine block but I keep breaking it. I did not know what size resistor to buy, and no parts store could help.
Since you mentioned the overheating of a resistor if the IGN is left on, I know I did not have a resistor, since I have left the IGN on far too many times and nothing ever got hot or melted. I bet it was a diode embedded in that rubber goop.
You show a 1N5408 diode. I know electronics, and how to use a Diode, but where I live, we do not have any electronics stores unless I drive 50 miles to the city and go to Radio Shack. So, I need to know the specifications for that diode. Radio Shack usually only rates them by volts and amps, and no actual part number. What do I need as far as volts and amps? Is the part critical, in as much as can I use any diode that is at least whatever amperage I need, and can handle at least 20 volts or so? I am asking because I have lots of old tv chassis with rectifier diodes, which wont cost me a cent or a long trip to the city.
One other thing. I noticed that many of the discussions on here mention that the tractors converted from 6 to 12 volts need a block resistor to the ignition coil (like in the old Chrysler cars). My coil does not have one. However, my coil is a 12V coil from a 12V car (I replaced it when I bought the tractor because the old one was arcing thru a tiny crack). Should I still have one, and why? It almost seems senseless to buy the resistor, mount it, and wire it, when 12V coils are a dime a dozen at most auto junk yards.
By the way My neighbor has a Farmall 400, and he has that resistor on his. His tractor was also converted to a 12V system. I dont know if he has the 6 or a 12V coil (they all look alike).
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