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, in addition, diagnostic testing.