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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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