Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Alternator: Description and Operation
The CS-type generator uses a internal regulator which features built-in fault detection. Model CS-130 and CS-130D generators are used on this vehicle
and are not meant to be disassembled for service. If the generator becomes inoperative, the generator is to be replaced.
Both generators use a delta stator, rectifier bridge, and rotor with slip rings and brushes. An air duct and external fan are used to cool the CS-130. A dual
internal fan is used to cool the CS-130D.
These generator may be used with only two connections: the "BAT" terminal to battery positive and an "L" terminal to the charge indicator. Using the
"P", "F" and "S" terminals is optional. The "P" terminal is connected to the stator and may be connected externally to a tachometer or other device The
"F" terminal is connected to the field lead through the PCM and can be used as a system monitor, as generator load increases, the PCM can adjust idle
speed accordingly. In this type of circuit the "L" can be used to energize the generator. The "S" terminal may be connected externally to a voltage, such
as battery voltage, to sense voltage to be controlled.
As on other charging systems of the charge indicator on the instrument panel lights when the ignition is on and the engine is not running. When the
engine starts, the indicator should go out. If the indicator comes on and stays on when the engine is ruining, there is a problem in the charging system.
The indicator will glow brightly no matter what problem it detects. The indicator will also come on when the engine is running if the system voltage is
too high or too low.
The regulator voltage setting varies with temperature. It limits system voltage by controlling rotor field current while the field current is ON. This
regulator actually switches rotor field current on and off at a fixed frequency of about 400 cycles per second to help control radio noise. By varying the
overall on/off time, correct average field current for proper system voltage control is obtained. At high speeds, the on-time may be 10 percent and the
off-time 90 percent. At low speeds, with high electrical loads, on/off time may be 90 percent/10 percent.
No periodic maintenance of the generator is required.