Alternator & Regulator: Description

The 120-amp, CS144 alternator is used in conjunction with a Body Control Module (BCM). CS stands for charging system and 144 denotes the outside diameter (in millimeters) of the alternator stator laminations.

A communication process exists between the BCM and CS144 alternator which permits the alternator to interface with the BCM. When the alternator circuit exceeds programmed limits, the malfunction may be indicated by the BATTERY NO CHARGE message on the telltale warning light cluster.

The voltage regulator, enclosed in a solid mold, is mounted inside the alternator. A capacitor, mounted in the end frame, protects the rectifier bridge from high voltage and suppresses radio noise.

The alternator and related charging system circuitry have self-diagnostic capability. When a malfunction develops within the system, the BCM will set a trouble code relating to the specific malfunction. Accessing the self-diagnostic system facilitates trouble code display and diagnostic testing.

The procedures to access the self-diagnostic system vary depending on the type of Instrument Panel Cluster (IPC) with which a particular vehicle is equipped. Vehicles equipped with a digital IPC are considered color Cathode Ray Tube (CRT) equipped. Vehicles with an analog gauge (floating needle) type IPC are considered non-CRT equipped. See Figure . For organizational purposes, vehicles in this article are referred to as being either CRT equipped or non-CRT equipped.