A LONG time ago GM/Delco came up with the best alternator system that was out there at the time.
It had a mechanical voltage regulator with a "field relay" inside of it.
Massive Ferguson, Oil Allover, and others came up with some creative circuits to derive some other functions out of the field relay in the Delco 10DN mechanical voltage regulator above and beyond what was ever done in a GM vehicle.
Fast forward 40 or 50 years, and aftermarket suppliers have developed replacement solid-state regulators that can do the basic functions of the old mechanical regulators but cannot fulfill every possible permutation that creative folks eked out of the old mech regulators.
You either need to find a "NOS" mech regulator, or do a bit of rewiring to make everything well again.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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