The CS charging system has several sizes available, including the CS-121, CS-130 & CS-144 alternators. The number (121, 130 or 144) denotes the outside diameter in millimeters (mm) of the stator
CS generators use a new type regulator and a diode trio is not used. A delta stator
, rectifier bridge, and rotor
with slip rings and brushes are electronically similar to earlier generators. A conventional pulley and fan is used and, on the CS-130, an internal fan cools the slip ring end frame, rectifier bridge and regulator.
Unlike three wire generators, the CS generators may be used with only two connections, battery
positive and an "L" terminal to the charge indicator bulb.
Use of 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 internally to field positive, and may be used as a fault indicator. 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, the charge indicator lights when the switch is closed, and goes out when the engine is running. If the charge indicator is on with the engine running, a charging system defect is indicated. For all kinds of defects, the indicator will be on with the engine running if system voltage is too high or too low. The regulator voltage setting varies with temperature, and limits voltage by controlling rotor
This regulator switches rotor
field current on and off at a fixed frequency of about 400 cycles per second. By varying the on-off time, correct average field current for proper system voltage control is obtained. At high speeds, the on time may be 10% and the off time 90%. At low speeds, with high electrical loads, on and off time may be 90% and 10%, respectively.
No periodic maintenance on the generator is required. The CS-121 and CS-130 are not repairable and may only be replaced as a single unit. The CS-144 is repairable.
Alternator testing procedure:
- Visually check belt and wiring and make necessary repairs.
- With ignition switch in RUN position and engine stopped, the charge indicator lamp should be on. If it is not on, disconnect harness at generator and ground negative terminal in harness with a fused jumper lead. If lamp lights, replace generator. If lamp does not light, locate open in circuit between ignition switch and harness connector and check for burned out indicator lamp.
- With ignition switch in RUN position and engine running at a moderate speed, the charge indicator lamp should be off. If it is not off, disconnect harness at generator. If lamp goes off, replace generator. If lamp stays on, check for a short to ground in harness between connector and indicator lamp.
- Check battery for an overcharged or undercharged condition as follows:
- Attach a suitable voltmeter, ammeter and carbon pile to vehicle.
- With ignition switch in OFF position, check and record battery voltage.
- Remove harness connector from generator.
- Turn ignition switch to Run position and check voltage at the brown wire in harness. Battery voltage should be present. If battery voltage is not present, check charge indicator circuits for open or grounded circuits causing voltage loss and repair as necessary.
- Reconnect generator harness connector.
- Run engine at a moderate idle and measure voltage across battery terminals. Voltage should read more than recorded in step B and less than 16 volts. If reading is not as specified, replace generator.
- Run engine at a moderate idle and check generator amperage output. Adjust carbon pile load to obtain maximum amperage while maintaining battery voltage above 13 volts. If amperage reading is within 15 amps of generators rating, generator is functioning properly. If amperage is not within 15 amps, replace generator.
- With generator operating at maximum output, measure voltage between generator housing and battery negative terminal. Voltage drop should be .5 volt or less. If more than .5 volt, check ground path from generator housing to battery negative and determine cause of voltage drop. Repair loose or corroded ground connections as necessary.