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SI to CS Alternator Swap, who has done this?

Discussion in 'The Garage' started by TrcksR4ME, Jun 22, 2003.

  1. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    I am going to swap on a CS series alternator and am wondering how big of deal this swap is. I did a little research and found that I will need to get a conversion plug for my SI style wiring.

    Also in this research there was something about gettin a conversion plug with or without resistence built into it in order to energize the alternator and make it work right. It needs a minimum of 35 ohms from what I read. The article I found said that if you have a battery light in the dash, this serves to create resistence and you are ok. I do not know if my '77 Blazer has this, and I do know that if it does it is broken. How would one check the wiring to see if there is resistence in it? Any other comments on this swap in general?
     
  2. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    anyone, anyone...am I the first one here to do this or something?
     
  3. BobK

    BobK 1/2 ton status

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    Throw an ohm meter on the wire and check it for resistance.

    SI to CS...just woundering why?
    You can build SI alts for higher amps pretty easy.

    The cases of CS alt were poorly designed(not enough ventalation) and fail frequantly.

    If you want a serpentine sysytem you can swap in a serp. pully onto the SI alt.

    Upgradeing the SI will keep your wireing the same,less headaches.

    Mad industries has a CS conversion package if you still want to do the swap.
    Click here to see it.It's about 3/4 down the page.

    Good luck.
     
  4. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    Well I got a good deal on a Powermaster Alternator that was tested to put out 91 amps at idle and 120 amps at cruise and thought why not?

    I am not too woried about failure, I don't put many miles on my truck in a year. I will swap on the old pulley instead of using the serpentine one.

    After reading about the swap it doesn't sound too involved and isn't permanent. Can always go back to the SI alternator.

    Thanks for the responce! /forums/images/graemlins/thumb.gif
     
  5. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Bob, we need to talk at BF. You seem to have a pretty good grasp of this stuff and there's a couple of concerns of my swap I want to talk to you about.
     
  6. BobK

    BobK 1/2 ton status

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    Bubba,sure,see you there.
     
  7. Depdog

    Depdog 1/2 ton status Author

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    Well, I did it in a 77 K5, least till I got my onboard welder. It worked just fine. You do have to have an adapter plug. AC Delco sells them. I have a battery voltage metter in my K5 and I believe (not positive mind you) that I had to have the one with the built in resistor. It worked like a champ and the alt really put out the power.

    I still have the alt and plug somewhere.

    Depdog
     
  8. heavy4x4

    heavy4x4 1/2 ton status

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    I'm going to play ignorant here and ask what's the difference between CS and SI (what do they mean), which one do I have, and why is one better then the next? /forums/images/graemlins/tongue.gif /forums/images/graemlins/ears.gif
     
  9. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    If you have a '90 its a CS. CS is the newer style alternator Chevy uses. It replaced the SI series and has more output than the SI series. As far as I know any of the vehicles with a v belt have SI and any with serpentine setup are CS.

    Naturally this information comes as is, no warranty /forums/images/graemlins/thumb.gif
     
  10. heavy4x4

    heavy4x4 1/2 ton status

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    Thanks. /forums/images/graemlins/thumb.gif

    Do you know what the CS and SI stand for? /forums/images/graemlins/confused.gif
     
  11. TrcksR4ME

    TrcksR4ME 1/2 ton status

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