tveltman

smallest pulley I found online (assuming that it would fit on the shaft) is 1 7/8" My guess is the stock pulley is somewhere around that size, so you'd probably have to get a shop to turn you one. The better option might be a new crank pulley, although that is far harder to swap than the alt pulley.

928mac

Has anyone found the correct Delco # for a 1989 928 conversion

MrAdequateWrench

I'd just like to say that I found this thread quite helpful. With your help, I just finished the install of a CS-130 onto the 4.7L in my 1982 928. I swapped the Bosch pulley onto the Delco-Remy alternator. I bought the pigtail at autozone. I had to grind a small relief in the lower mounting bracket. I epoxied a 5mm jam nut onto the main mounting lug of the new alternator, to make up for the difference in size. I had to buy a shorter belt. I had to solder one wire while lying on my back under the car. Now I have 14+ volts at the battery at idle...

cgraner

Does anyone have any pictures of this setup and the wiring information?

It looks like that 1988 Camaro, 2.8L alternator crosses to these vehicles:
https://www.rockauto.com/en/catalog/chevrolet,1988,camaro,2.8l+173cid+v6,1035649,electrical,alternator+/+generator,2412
BUICK CENTURY 1987-1992 CHEVROLET ASTRO 1987-1990 CHEVROLET CAMARO 1987-1992 CHEVROLET CELEBRITY 1987-1990 CHEVROLET LLV 1987-1993 CHEVROLET LUMINA 1990-1992 CHEVROLET S10 BLAZER 1987-1988 CHEVROLET S10 PICKUP 1987-1993 GMC S15 JIMMY 1987-1988 GMC S15 PICKUP 1987-1990 GMC SAFARI 1987-1990 GMC SONOMA 1991-1993 OLDSMOBILE CUTLASS CALAIS 1990-1991 OLDSMOBILE CUTLASS CIERA 1987-1992 OLDSMOBILE CUTLASS CRUISER 1987-1992 OLDSMOBILE CUTLASS SUPREME 1990-1991 PONTIAC 6000 1987-1991 PONTIAC FIREBIRD 1987-1992 PONTIAC GRAND PRIX 1991

Landseer

Use the 100 or 105 A unit.

Buy the Painless pigtail or equivalent, because the new alternator has recessed terminals that need to be accessed.

Works on the 16 V., btw.

(for 32 V, see Bulvot's post to learn about Ford upgrade)

Mounting is a little cobbled but sound. Pivot bolt gets a few flat washers to take up space to make up for alt body being narrower than stock.

I loose the nice belt tension adjuster screw due to geometry, but keep the slotted arched piece, and a simple bolt to pin alternator. So its prybar tightened and pinned with screw like a typical GM of the day.

Early 928 had V belt. Later 16V had ribbed flat belt. You might have to swap alt pulleys. I think the stock pully will swap over to the delco if nec. Diff diams are possible and can change output.

Might be nec to find a shorter belt. My swaps used stock flat ribbed belt; others folks mentioned needing shorter one.

Loose the porsche plastic ventilation cover and hose for this non factory workaround. Obvious cobble job, which works for a driver car. That means the alternator isn't pulling air across the HVAC sensor in the wheel arch on inlet end of the hose.

Heavy lugged 928 wire goes directly to alternator terminal. I had to clip off lug and replace with smaller lug. Save the original.

4 other terminals, into which the painless harness plugs in, are labeled SFTL. Use only L and connect it to the green exciter wire. Rest of Painless pigtail terminal wires can be clipped.


There have been numerous threads more focused on the correct specific Delco conversion. There might be pics in some of them. Seems like we always came up way short of a Dwayne type play by play, and always left it ambiguous. I tried to clean up the steps, from memory. Other guys will hopefully weigh in.

Sharkskin at the time was working extensively to modify another bigger heavier version of C130, which is a whole other merry chase, and where this particular thread began. There were alternator shops involved, experiments with fitment, but IIRC not ever executed.

Hope that helps.

Jerry Feather

I have read most of this thread twice now and then scanned it again and I can find nothing posted about the Ford conversion for the later cars by "Bulvot." Who it that, and where is the post.?

Kevin in Atlanta

Look here

Farginicehole

@Landseer
"Loose the porsche plastic ventilation cover and hose for this non factory workaround. Obvious cobble job, which works for a driver car. That means the alternator isn't pulling air across the HVAC sensor in the wheel arch on inlet end of the hose."

Am I interpreting this correctly that you are saying it's okay not to use any sort of cooling shroud with the CS130 105A alternator? Mine just arrived a couple days ago. I have looked all over for that GM shroud, but as was said years ago in this thread, it is no longer available. I haven't gone searching through junkyards yet. If necessary, I might even be able to have a fellow engineer create something in CAD and 3D print it? My car is a '84 Euro 5-sp twin dizzy 4.7L, btw.

928FIXER

If you get a 3D cad file for it,I would be interested, just to complete the "look" of having all the items under the hood hooked up.

I did this conversion back in 2002,way before this thread started. I put over 100K on the delco before it stopped charging. Took it and the receipt back to my supplier and they handed me a new one. Still on the car with 50K on it.

Farginicehole

@928FIXER Are you running these Delco alternators without a cooling shroud? It seems that the Painless Performance and also the Napa pigtails are NLA. I haven't gone to an auto parts store yet, but assume there are other options readily(?) available.

Mrmerlin

NOTE Bulvot Last Activity: 12-22-2022 07:31 AM

I hope he didnt get run off,
he is a really smart guy ,
and he owns a car that I worked on extensively,
from SLC era.

Humm..

928FIXER

I ran it without a cooling shroud or tube for over 100K before the first one acted up.2nd one is still on car,ran it for a few more years then mothballed the vehicle.
In the actual GM application that I first noticed the alternator,the OEM manufacture did not have any type of cooling system hooked up to it,so I installed it the same way.
Car was a daily driver and and been used that way for the first 2 owners ,kind of a 20 footer but the price was right.

Krandyth

I know this is an older thread but well worth the upgrade. I have the parts on the way but have one question before I start the project.

The small red wire on the painless needs to go all the way back to the battery correct? I see the exciter wire and the big alternator output wire but that's it. So... Run a new wire back to the + batt post? Also, do we need to do anything with the supplied resistor for the excite wire?

Thanks

WestInc

I have done it like this simple scematic. Without resistor and hooked into the original sensewire, excitewire and chargewire.
My car is a 1983 928s Euro. Since you haven't written your car spec's, we cannot be sure that this solution works for you though...

Farginicehole

@Krandyth Did you manage to find a Painless pigtail? As far as I could tell, they are NLA. I haven't had time to go search for an equivalent.