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 - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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