For 1990-2009 cars

# Generator and Engine Wiring Harness Design Change

Subject: | Service Information on Generator and Engine Wiring Harness Design Changes

Models: | 1991-1997 Saturns

### Purpose:

This bulletin provides information on a design change of the generator assembly, and the impact these changes have made on servicing vehicles.

Generator Assemblies

Saturn vehicles now use 3 different generator assemblies. The following chart shows the usage for these 3 generators.

Description | Service P/N | Model Year | VIN Range
--- | --- | --- | ---
CS130 85 Amp | 21023724 | 1991-1994 | All
CS130 96 Amp | 21023515 | 1995-1996 1997 (Partial) | All VZ100000-VZ266825 VZ267043-VZ300901
CS121D 90 Amp | 21024726 | Interim 1997 | VZ266826-VZ267042 and vehicles built after and including VZ300902
Important: The CS121D can only be used to service vehicles that were produced with this generator.

The following information describes the differences in the physical appearance, service diagnostics, and removal and installation procedures of the CS121D generator.

Physical Appearance

The CS121D generator uses a different electrical connector, requires no generator splash shield, and has dual internal fans.

Service Diagnostics

Follow the service diagnostic procedure within the Electrical Service Manual except for the following difference:

A good CS121D generator will provide a minimum output greater than 63 amps when performing the generator output test on the Saturn electrical system tester-- SA9154Z.

Special Service Tools

Both the CS121D generator and the CS130 generator require the use of an output stud wrench -- SA9401C-- when removing the fusible link wire.

Notice: If the B+ stud is not held with the output stud wrench SA9401C, and the B+ stud rotates, the insulator may break causing the generator to fail.

### Engine Wiring Harness

The engine wiring harness used with the CS121D generator was changed to accommodate the new generator connector. Generator connector kit P/N21024414 and lead kit 12116713 are available for harness repair.

1997 Vehicles Equipped With CS121D Generator | Engine Wire Harness Part Number
--- | ---
Base Auto (L24 and MP6) | 21023830
Base Manual (L24 and MP2) | 21023832
Perf Auto (LL0 and MP7) | 21023831
Perf Manual (LL0 and MP3) | 21023833
Perf Auto RHD (LL0 and MP7) | 21023834
Perf Manual RHD (LL0 and MP3) | 21023835