Section 90 (Charging System - Generators & Regulators): Operation
WARNING: This page is about a different car, the 1996 Eagle Vision, 1996 Dodge Intrepid, 1996 Chrysler New Yorker, 1996 Chrysler LHS, and 1996 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM), maintains a system charging voltage of approximately 13-15 volts. PCM determines a target voltage based on inputs from battery temperature sensor (ambient temperature near battery). PCM compares target and battery voltages whenever engine is running. If battery voltage is less than target voltage, PCM will provide more field current. If battery voltage is greater than target voltage, PCM will provide less field current.