DESCRIPTION
Two types of alternators are used: 12/17SI series and CS130/144 series. The first series is designated SI (Systems Integral) because of the built-in regulator. The solid state regulator is enclosed in a solid mold. This unit, along with brush holder assembly, is attached to the slip ring end frame. Regulator voltage setting cannot be adjusted. All 12SI alternators have "Y" type stator windings, while all 17SI have delta type windings. A condenser, mounted in the end frame, protects the rectifier bridge and diode trio from high voltages and suppresses radio noise.
The CS130/144 (Charging System) alternators have a high amperage output. The 130 or 144 designation is the outside diameter of the stator laminations, measured in millimeters. This alternator series also has an integral regulator but does not have a diode trio. The delta wound stator, rectifier bridge, rotor with slip rings, and brushes are similar to other alternators.
