How to identify your GM Internally Regulated Alternator

Delco Remy (System Integrated) SI alternator were used on GM vehicles between 1969-1988. They were primarily used on vehicles between 1975-1985. Two of the most commonly used models were the 10SI and 12SI alternators.

Two key identification points of the SI alternator is the external fan with V belt pulley and the 2 charge indicator light terminals (male blades) that appear on the backside of the alternator.

The pictures below show the front and rear of a SI alternator and a picture of the connector that plugs into the alternator.

Delco Remy CS130 / CS144 alternatorswere used on GM vehicles between 1986-1999. The CS144 is visibly a larger alternator than the CS130 and CS130D as shown below.

Two key identification points of the CS130 / CS144 alternator is the external fan with a serpentine belt pulley and the 4 charge indicator light terminals (1 large and 3 smaller) that appear on the backside of the alternator.

The pictures below show a CS130 alternator vs. a CS144 alternator and the connector that plugs into the alternator.

Delco Remy CS130D alternators were used on GM vehicles between 1994-Beyond.

Two key identification points of the CS130D alternator is the internal fan and vented case with a serpentine belt pulley and the 4 charge indicator light terminals (all the same size) that appear on the backside of the alternator.

The pictures below show a CS130D alternator and the connector that plugs into the alternator.