OP here. Charging voltage is now back to normal (also no more voltage "cycling") after ambient temps rose above 50 during the last few days. I guess that confirms our Ram does have a temperature compensated charging system.
Although I understand the need for higher charge voltage when temps get very low, I don't quite understand the need for the grid heater "cycling" I experienced when temps got down to zero or so. Why does the grid heater need to cycle while the engine is running? Why not remain on for a certain period like it does when it preheats before starting the engine?
