Mornin neighbor, good question: When wiring a GM 3 wire alternator to prevent feedback which might allow the gas engine to run even with the IGN turned off (alternator back feeds ignition coil), I have used:
1) Resistors in the 10 ohms or so range and even though such power isn't required, I might use a 5 or 10 watt just because they have bigger stronger leads which may be easier to wire and attach.
2) Incandescent small tail/marker light bulbs because their resistance can prevent run on PLUS they serve as a charge indicating "Idiot Light" My friend Bob M has, I believe, placed a resistor in parallel with the bulb so if the bulb burns out it still works.
3) Diodes anywhere in the 3 to 10 amp range with a voltage withstand rating of maybe 50 or more volts. Again, a bigger unit (though not needed) will have bigger stronger leads. Rat Shack has them. DONT FORGET THEY ARE POLARITY SENSITIVE so wire them with the - towards the alternator.
Ive even had some tractors that didn't run on EVEN WITH NO DIODES and I've seen them with much higher (then 5 or 10 ohms) ohms resistors that still worked.
Resistor or an incandescent idiot light or a diode will work, your money your tractor your choice.
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