Charging voltage question?

And it is good. The OEM regulator has temperature compensation, as it gets warm the charging drops off. The assumption is the battery has similar temperature or less than regulator. The compensation is for flooded lead acid, not AGM.

If you monitor the battery temperature and the voltage, and it fits within table, that is good. But, that is only part of the story.

AGM are maintained by float voltage, but full charging happens at constant current, to meet a voltage per a different spec, followed by an absorption period. This type of charging takes a smart charger or regulator, for optimal performance. The OEM Mopar regulator does not measure, nor control current. It controls only float voltage for flooded batteries.