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He said he checked it with a meter before, so he wasn't just relying on the gauge. Try running a separate 'sensing' wire (the small one) directly to the battery + and see what your voltages are then. If it goes up to 27-29 volts, you have a bad connection in that circuit running to the alt...

Dropping voltage after warming up is almost a sure sign of pending regulator failure. I have an entire pile of alternators, most just needing bearings, some regulators. Maybe one day I will start rebuilding them all, especially with how expensive they seem to be getting.