Alternator & Regulator: Description

The CS series alternators are available in 74, 85, 100, 105 and 120-amp output. The alternators use a delta stator, rectifier bridge, and rotor with slip rings and brushes. A built-in regulator incorporates fault detection circuitry. Conventional pulley and cooling fan are used.

CS series alternators operate with 2 wire connections and a ground path through the mounting bracket. The first wire connection is the battery positive "BAT" terminal. This terminal must be connected to the battery during operation. The second wire connection is through the indicator or suitable external resistor to the "L" terminal of the regulator. This connection serves to turn the unit on at start-up.

Three other regulator terminals, "P", "I" and "S", are provided for optional use. The "P" terminal is connected to the stator and may be connected to a tachometer. The "I" terminal provides an alternate method for turning on the alternator without going through the indicator light or external resistor and is often used in parallel with the "L" terminal connection. The "S" terminal may be used to sense electrical system voltage somewhere else on the vehicle for voltage control. If the "S" terminal is not used, the regulator uses an internal voltage sense for control.

No periodic maintenance of CS alternators is necessary. CS144 alternator can be disassembled and repaired. All CS121 and CS130 alternators are non-serviceable and must be replaced as complete assemblies. See the ALTERNATOR SPECIFICATIONS  to determine model number and amperage of individual units.