[Rygrego]

Updated - I had the battery changed this morning , and also the sensor.
the old battery was starting to swell (https://www.oreillyauto.com/detail/...rd?q=super+start+battery+extreme+24rext&pos=5 )

With both batteries. The voltage was in the 12's , until I put the lights on and it rose to the 14s.
the old w/ old sensor
The new w/ new sensor

OLD BATTERY: https://www.oreillyauto.com/detail/...rd?q=super+start+battery+extreme+24rext&pos=5

NEW BATTERY: https://www.autozone.com/batteries-...ery-51r-dlg-group-size-51r-500-cca/330111_0_0

This is the proper operation for the alternator. The ECM controls its charging rate all depending on load. Nothing to worry about.