Identify a Delco alternator using the charger light connections, location of the fan, size of the unit and the type of belt pulley. Between 1969 and 1988, General Motors used Delco SI alternators. GM used Delco CS130 and CS144 alternators on vehicles between 1986 and 1999. Between 1994 and 1999, the company used CS130D alternators.Continue Reading
The two most common Delco SI alternators were the 10SI and the 12SI. Both SI alternators have external fans and a V-belt pulley. They have two male blades on the rear of the alternator and use a plastic plug that fits over the blades to connect it to the instrument panel and the charge indicator light. The units look much alike, so refer to service manuals to determine the correct replacement.
The CS144 is much larger than either the CS130 or 130D. Both the CS130 and the CS144 have external fans and serpentine belt pulleys. These units have three smaller pin connectors and one larger connector arranged in a straight line at the back of the alternator. They connect by means of a single plug that accommodates the pins. With the CS 130D Delco moves the cooling fan inside the alternator. This model has four charge plug pins, but all are the same size.Learn more about Car Parts & Maintenance