Delcotron Type CS Charging System

CS130 and CS144 alternators may be used with only two connections. The battery positive BAT terminal must be connected to a battery during operation. The second required connection is through the indicator light, or a suitable external resistor to L terminal of the regulator which serves to turn unit On at start up. Three other regulator terminals are available for optional use in vehicle systems. The P terminal is connected to the stator, and may be connected 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.

The regulator voltage setting varies with temperature, and limits system voltage by controlling rotor field current. Unlike others regulators, this regulator switches field current On and Off at a fixed frequency about 400 cycles per second. By varying On-Off time, correct average field current is obtained to provide proper system voltage. At high speeds, the On time may be 10% and Off time 90%. At low speeds with high electrical loads, On-Off time may be 90% and 10% respectively.

Alternator systems on some applications are controlled by a Body Control Module (BCM). If cause of a system malfunction cannot be determined, a problem in the electronic control system is indicated.