Pilot, a Ballast Resistor used on coil ignition systems is more like 1.2 to around 2 ohms NOT 25 ohms. If a 25 ohm were used as a ballast resistor on an ignition system there wouldn't be any spark.
When people used a Delco 10SI type of 3 wire alternator they often used a diode while some such as myself used a 10 or so ohm resistor to prevent ignition feed back and run on. But that was in the EXCITATION circuit from the ignition or coil to the small side No 1 terminal on a 10 SI Delco alternator I HAVE NO IDEA WHAT YOU HAVE OR HOW ITS WIRED.
The big main output on an alternator would NOT go through a 25 ohm ballast resistor, it would go to an ammeter or the dash so it gets to the hot battery post eventually.
I don't know if yours is an excitation circuit resistor (like 3 wire Delco 10 SI used) or what it is but I dont see a 25 ohm ballast in the alternators big main output regardless of what alternator you have.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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