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Old 12-20-2008, 04:01 PM
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CS130 Wiring Question

Ok I have went through 2 cs130's. I have installed this in my 75 vette. The first cs130 lasted about a year and a half. It was hooked up with the s terminal to the back of the alt and the l to a 12 ignition hot. The second cs130 after i was told to use a resitor was hooked up the same way just with a 15 ohm 2 watt resistor like the painless wiring adapter uses. well the 2nd one with the resistor lasted only 6 months. So i have the new alt installed in the car and found these 2 diagrams. I do not have the idiot light or the factory wiring harness. I have an ez wiring harness in the car. So which one of this pics is correct for using the cs130 without a idiot light or resistor.

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Old 12-20-2008, 05:46 PM
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The second diagram is correct. My understanding is that the L lead is for use with a charging lamp. In taking a look at one of Painless diagrams, they confirm that as well.
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Old 12-21-2008, 09:50 AM
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Basically, all you need is a switched 12 volt source wire connected to the "L" terminal to excite the regulator. If you have a charge indicator light, this wire should be connected to the "L" terminal. If no indicator light is used, its recommended that you add a resistor in series to protect the internal regulator(Powermaster recommends a 47 ohm resistor, Painless Wiring recommends a 82 ohm resistor). Some people use a diode in place of an indicator light. Using a diode will show a .7 voltage drop to the alternator, which will then cause the alternator to up the "output current" thinking the battery needs additional charging. The use of a diode is not recommended.

The "L" terminal (charge light) is fed from the ignition through the charge light. This connection turns the alternator "on". Without a signal to turn "on" the regulator will not charge. However, the "I" terminal may be used to turn this alternator "on", instead of the "L" terminal. If the "L" terminal is used to turn the alternator "on", then the "I" terminal is not used, and vice versa.

The "P" terminal is the phase connection terminal. This terminal sends a signal to a relay, frequency sensing tach or computer indication alternator speed. Not required for your use.

The "F" terminal is the field monitor. This terminal sends a signal to the computer(if so equipped) telling it how much field current is flowing, so the computer knows how hard the alternator is working. This terminal can only be used if the alternator is turned on by the "L" terminal. This terminal is not required.

The "S" terminal is the Battery Sense Connection. This terminal is larger than the others and provides the alternator with a precise battery voltage reading. This connection may not always be used. When not used, the alternator will automatically sense battery voltage at the battery post.

Once you get the CS wired and running, I would check the voltage at the battery terminals to make sure that you have 14-14.7 volts, indicating that you have the alternator operating correctly.

Here are a couple of links to additional CS alternator info:

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Old 12-21-2008, 10:42 AM
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The CS130 has a problem even in stock applications. I went through one a year in a stock 1992 Buick until I found the tech bulletin. The electronic regulator in the CS130 is very sensitive to the quality of the ground path. Unfortunately, the electronics are in the rear frame and the alternator mounts to the block only through the front frame. Corrosion builds up between the aluminum end frame and the iron stator core, which results in a bad ground and a failed voltage regulator. The tech bulletin calls for the installation of a ground strap from the rear frame directly to the block. I did this and never had another problem.
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