Upgrade from CS130 alternator to later and improved CS144

This is a tech tip I posted in Corvette Forum in 2002.

The CS-130 alternator used in many L98 C4 Vettes is famous for its abily to selfdestruct unexpectedly. Many have dreamed about better alt. There is one: CS-144 used in ZR-1's (124Amp) and in the very last years of C4 LT-1 and LT-4 Vettes (140Amp).

I replaced mine with the 124Amp model. My car is a '91 coupe, the installation is similar to other years too but check first whether your alt brackets are diffirent or not.

Here is how it is done: It is otherwise a plug and play installation but a attachement ear must be modified so it can fit the stock upper bracket. You need to file the smaller (upper) ear on the alternator front casing. Remember to file only from the windshield (rear) side of this ear. This way you can be sure the belt aligment is correct after filing.

The ear on CS-130 16mm (0,63") and on the CS-144 20mm (0,79") thick. So you need to file away 4mm (0,16"). Remember to smooth all edges to eliminate stress points on the ear.

After this the installation is straigthforward. Only the rear support rod doesn't fit. The "clock position" of the rear casing doesn't matter as it will not fit in any way - CS-144 is longer than CS-130. I found the installation to be very rigid even without the rear rod but you can easily fabricate a new one if you feel unsure. The clock postion of the casing is only relevant to the wiring, make sure they are easily connectable. The CS-144 I used needed no fiddling with the case clock position.

This CS-144 unit had a bit bigger belt pulley than the stock CS-130 but it works just fine with the stock belt. Because of this pulley, the alt operates at lower rpm than the stock CS-130. This makes it stay even cooler and there was no noticeable difference in volt meter indication compared to original.

Update 2005: After there was some talk in the CF that a insufficient grounding might contribute to alternator deaths in C4's I added a extra ground to make the life of the alt a bit easier, middle picture shows this.

Part numbers for th 124A CS-144 I used are ADC# 321-567 GM# 10463257

Hope this helps anybody else frustrated with the CS-130.

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