I would look for bad cables.
Engine running the dash reads alternator output, shut the motor down & it reads battery output.
At cold start up 14.0 is normal and should settle maintain 13 to 13.5 while driving. Get the battery load tested, just cause its new doesn't mean its good.
Bad cables can cause this discrepancy not allowing full charging current to make it to the battery. This car needs a tip top charging system to power all the controls.