Conversion to CS style alternator

[Longroof79]

I've been wanting to replace my old low amp 10si alternator for a later, higher(105) amp CS style unit. If I pull a junkyard unit, what model GM cars have alternators with proper compatible clocking to fit a V-belt small block chevy? I believe it would be a 12-6 mounting. Thanks.

Jack

 

[joe_padavano]

I've been wanting to replace my old low amp 10si alternator for a later, higher(105) amp CS style unit. If I pull a junkyard unit, what model GM cars have alternators with proper compatible clocking to fit a V-belt small block chevy? I believe it would be a 12-6 mounting. Thanks.

Jack

I've pulled a couple CS130s from FWD cars with the Series II 3800 motor - mainly the H-body cars like the Olds 88, Bonneville, etc. These have the correct 12:00/6:00 clocking on the lugs. Check the amperage, as I have seen both 85A and 105A on these cars. The serpentine pulley is easily swapped for a V-belt pulley if you need that.

 

[84GP455]

And these alternators can be bumped up to 130amp as i have done to mine, good luck!

 

[Longroof79]

I've been wanting to replace my old low amp 10si alternator for a later, higher(105) amp CS style unit. If I pull a junkyard unit, what model GM cars have alternators with proper compatible clocking to fit a V-belt small block chevy? I believe it would be a 12-6 mounting. Thanks.

Jack

I've pulled a couple CS130s from FWD cars with the Series II 3800 motor - mainly the H-body cars like the Olds 88, Bonneville, etc. These have the correct 12:00/6:00 clocking on the lugs. Check the amperage, as I have seen both 85A and 105A on these cars. The serpentine pulley is easily swapped for a V-belt pulley if you need that.

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Thank you Joe,
That's exactly the info that I was looking for. I assume that the amps designation is stamped somewhere on the alternator body? I do plan on replacing the serpentine pulley with a V-belt pulley.

 

[Longroof79]

And these alternators can be bumped up to 130amp as i have done to mine, good luck!

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How were you able to achieve this? Not that I would need anything more than 105A.

 

[84GP455]

And these alternators can be bumped up to 130amp as i have done to mine, good luck!

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How were you able to achieve this? Not that I would need anything more than 105A.

Well if you have a kickin stereo system you definitely need it, by changing the rectifier,regulator, and stator and brushes you can achieve 200 or even 300amps if you want.

 

[FE3X CLONE]

Here's a decent right up on a 140A alternator upgrade/swap:

http://tech.oldsgmail.com/echa_140a.php

 

[donnyR]

i believe youre gonna need a wire adapter

 

[joe_padavano]

i believe youre gonna need a wire adapter

You can get the adapter from NAPA. Note that there are two versions, one for itiot light and one for gauges that has a resistor built in. You can also simply cut the connector at the wrecking yard and splice it into your harness. The amperage rating is stamped on the CS130 housing.

 

[donnyR]

yeah heres a good write up post on the swap it has all the info you will need for the swap. good luck and go for it you wont be dissapointed i did it before on chevy powered cutlass and it turned out great. http://www.montecarloss.com/community/u ... Post493219