You can use your choice of "MY" diode, "BobM's" "idiot light", or "JohnT's" resistor anywhere that's conenient in the wire feeding power from the ignition switch to the alternator's #1 "switched excite" terminal.
You only need ONE of those three options, and ALL work EQUALLY WELL.
If you want an "idiot light" in the dash, go that route. USe a #194 lamp, or one of equivalent current draw.
If you want to use a resistor, go that way, but be advised it will get HOT, if the key happens to get left on, so you need to mount it so that it can dissipate the heat without melting any wires.
That's why I almost always use the DIODE... it provides protection to the alternator if there's a problem in the high-current part of the charging system wiring, and prevents the engine from "running on" when the ignition is switched "OFF", but it doesn't get HOT, so it can simply be covered in heat shrink tubing, and taped up along with the other wires in the harness.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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