wired alty. problem. please help please please...

[farmerz24]

ya so im having a wierd problem here. first off can anyone tell me what the 3 wires of a 95 style alt. do. i know 1 is rewquired to have switched power so that the alt. will charge when powered. the other 2 im not sure of i looked at another car (91 cutlass with the same style plug) and there is a thick red with 2 thin (1 thin being the switched power). the other 2 have constant power to them at all times. now i only hooked up the switched power on my car. This was with a BN alternator. i ran it that night and then shortly after my alt is no longer charging and my car is dead. SO i am wondering maybe the other 2 (thick and other thin) are required to give power to the alternator to regulate the voltage maybe??? because after installing this new alt. it only lasted about 3 h before it cooked and is no longer able to charge.

Someone please help.. if you could at least tell me what the other 2 wires on that 3 pin plug do that would be greatly appreciated. i think maybe they must be connected to avoid kiling the alt? also noticed the alt. humming sound right after hooking the BRAND NEW ac delco alt. up.

THanks
CHris

[bszopi]

RE: wired alty. problem. please help please please...

Not sure if this will help, but...

DESCRIPTION
The CS alternator is available in three sizes: CS-121, CS-130, CS-130D and CS-144. The numerals denote the outer diameter of the stator laminations in millimeters and the letters CS stand for charging system. The CS-144 can be serviced. The CS-121 and CS-130 series are serviced as an assembly only.

The CS alternators, Fig. 1 and 2 , 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 electrically similar to earlier alternators. A conventional fan mounted next to the pulley pulls air through the assembly for cooling. An internal fan mounted on the rotor pulls air through the slip ring end frame to cool rectifier, bridge and regulator. Air is expelled through openings in the end frame. No periodic maintenance is required.

OPERATION
CS-130 and CS-144 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 using the following test procedure, a problem in the electronic control system is indicated.


For the plug, starting with the big pin, the pins are labeled S-F-L

[farmerz24]

RE: wired alty. problem. please help please please...

interesting.. but i still dont know why it failed on me only after an hour of operation. i have only the output conected directly to the batt and power applied to teh exciter which should allow it to work (and it was working but just failed..)

hmmm i dunno...

anyoen else

[Juglenaut]

RE: wired alty. problem. please help please please...

ECM control and exciter. The large red one is Power (hot) common and the chassis is ground. The Weather pack connector is for ECM control and exciter.