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alternator identification?

Discussion in 'GM Electrical Tech' started by quicksilver8817, Nov 6, 2012.

  1. quicksilver8817

    quicksilver8817 New Member

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    how do i figure out which alternator cam on the factory setup of my 2001 gmc 2500hd 4x4 .. it does have plow prep.the alternator has been replaced once by previous owner . i notice a 105amp , 130amp , 140 amp replacements available from autozone .. can i use any of those ore does it have to be a factory spec one?
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  2. T-bone

    T-bone New Member

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    You can post a picture here and someone will likely be able to tell you. Also remove it and bring it to your parts store and compare to the different flavors available. Shoot off the hip guess is that you can rule out the 105, its either the 130 or 140. Autozone is fine but get the right one
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  3. Pikey

    Pikey Moderator

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    you could always try putting the vin in here http://www.compnine.com/vid.php It will tell the rpo codes and what they mean. It should tell you what size was on it from the factory
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  4. quicksilver8817

    quicksilver8817 New Member

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    i mean i guess what im asking is if the 145amp fits correctly , would it hurt anything to run a higher am alternator?
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  5. T-bone

    T-bone New Member

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    hard to say.

    more juice higher incidence of blowing fuses...

    unless you have a specific need stick OEM
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  6. Conlan Rose

    Conlan Rose Super Moderator

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    Alternators have a built in regulator that prevents sending out to many amps it works on an on demand basis.
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  7. Crawdaddy

    Crawdaddy Moderator

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    Yep, going with a higher amp alternator won't hurt anything so long as it's the same series of alternator and fits in the bracket.
    #7
  8. quicksilver8817

    quicksilver8817 New Member

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    thanks guys .. i do have certain needs , i plow so between running the plow , strobes , and whatnot i feel better having a higher output alternator .. i think i may also run a second battery too.
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  9. Conlan Rose

    Conlan Rose Super Moderator

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    A few things:
    1. Second battery only increases power when starting and helps add capacity to running stuff when the truck is off, for when the truck is on the alternator does all the work
    2. you might want to look at a bigger than factory spec alternator if you are running so much stuff. A Lot of people on the site are getting into DC power alternators they are ridiculously powerful and reliable. This Christmas I'm getting one for my self :glasses: site: https://www.dcpowerinc.com/high-output-alternators.html?make=GMC&model=Sierra&year=2001
    3. An extra battery can be wired a couple different ways. Way one: easiest only need the second battery relay 2 new batteries and cables for second one, I'm not going to fully explain it but all you are doing is adding a second starting battery. Way two: both batteries are charged by the alternator but they run different things, one is dedicated starting battery other runs accessories this is the best way because you don't need to worry about running down you starting battery when running lights and stuff, but this way is much more difficult to set up. Either way bother batteries must be the exact same age, type, amps, and brand or it can cause problems.
    #9
  10. PantheraUncia

    PantheraUncia New Member

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    The 105amp is the "standard alternator" I have that in my 2000 1500. The 135 or 145 amp was for heavy duty applications like the snow plow prep package...... Funny thing now is the standard alternator on a 1500 now is the 145 or a 165 and the heavy duty is bigger.

    If you have allot of stuff you plan on running you can get a 350amp alternator after market for your truck for some serious $$$$$
    #10
  11. ChevyFan

    ChevyFan Administrator Staff Member

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    #11
  12. quicksilver8817

    quicksilver8817 New Member

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    i just figure that if i have to replace it i mind as well upgrade a little lol
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  13. quicksilver8817

    quicksilver8817 New Member

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    i ended up going with the 145 amp from autozone .. it fits perfectly and has a lifetime warranty
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  14. quicksilver8817

    quicksilver8817 New Member

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    do you guys think i should need to upgrade some of the cables since i upgraded the alternator
    #14
  15. Jamm3r

    Jamm3r New Member

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    Hi folks some more light on the GM alternator situation since it's kinda confusing.

    For a long time The General has used both small-frame and large-frame alternators depending on the truck, with diesels and plow trucks getting the large-frame and most of the others getting the small frame. Large frame alternators produce more output at idle, and have slightly higher maximum output.

    Here is a chart I have compiled based on various sources.

    [TABLE="class: grid, width: 500"]
    [TR]
    [TD]Year
    [/TD]
    [TD]Large-frame
    [/TD]
    [TD]Small-frame
    [/TD]
    [TD]Notes
    [/TD]
    [/TR]
    [TR]
    [TD]1973-1986
    [/TD]
    [TD]17si, 108 amp
    [/TD]
    [TD]10si & 12si, 94 amp
    [/TD]
    [TD]External fan, two-pin square control connector
    [/TD]
    [/TR]
    [TR]
    [TD]1986-1995
    [/TD]
    [TD]CS-144
    [/TD]
    [TD]CS-130, 105 amp
    [/TD]
    [TD]Four pin square control connector, external fan
    [/TD]
    [/TR]
    [TR]
    [TD]1995-1999
    [/TD]
    [TD]CS-144
    [/TD]
    [TD]CS-130D, 105 amp
    [/TD]
    [TD]CS-130D: has oval control connector and internal fan
    [/TD]
    [/TR]
    [TR]
    [TD]2000-2002
    [/TD]
    [TD]AD-244, 145 amp
    [/TD]
    [TD]AD-230, 105 amp
    [/TD]
    [TD]Oval control connector, internal fan
    [/TD]
    [/TR]
    [TR]
    [TD]2002-2009
    [/TD]
    [TD]DR44g, 145 amp
    [/TD]
    [TD]AD-230, 105 amp
    [/TD]
    [TD]Oval control connector, internal fan
    [/TD]
    [/TR]
    [/TABLE]

    All of these are internally regulated alternators and are electrically interchangeable. All were made in several different mounting configurations, but all the 1986 and later truck applications, as far as I know, used the dual-spool mount and are interchangeable, though switching from small-frame to large-frame requires a 1.5" change in belt length and it may be necessary to install a different control connector (or use an adapter).

    The original CS-130 and CS-144 designations correspond to a case diameter of 130mm and 144mm, respectively.

    In mid-2000 GM switched from a four-pin oval connector to a two-pin connector with the timing of the switchover varying from one chassis to the next. The extra pins were an unrectified stator output used as a tachometer drive in some applications, and a field terminal used for diagnosing alternator problems, and were dropped as a cost-reducing move. I don't think either of these was ever used for anything in a truck application.

    For 1986 and later trucks, if you have a small-frame alternator and want to replace it with another small-frame alternator, you're best off installing an AD-230 and using an adapter if necessary for the control connection.

    Again for 1986 and later, if you need to replace or want to switch to a large-frame alternator, you're best off getting an AD-244 and adapting the wiring as necessary, although a DR44g may be cheaper and will work fine if you don't run large enough loads for diode failures to be a problem.

    - - - Updated - - -

    The output cable is a known weak point and should be upgraded if you have any electrical mods that ask a lot from the alternator (plow, camper, winch, extra lights, inverter). 6 gauge is a good compromise between flexibility and current carrying capacity.
    #15
  16. quicksilver8817

    quicksilver8817 New Member

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    so i should uprgrade the alt cable because i run a plow correct?
    #16
  17. Conlan Rose

    Conlan Rose Super Moderator

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    Yes u should upgrade. Also upgrade the grounds. Btw KnuKoncepts makes amazing super flex able cables even the 1/0 AWG moves like rope just get the OFC Flek Able it candidates handle 375 amps. The 4 gauge is pretty good too. Check it out.
    #17
  18. quicksilver8817

    quicksilver8817 New Member

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    ill look into it thanks
    #18
  19. jsmith4816

    jsmith4816 New Member

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    ConlanRose, did you ever get the DC conversion? I am looking into this as well. When you say, upgrade grounds, do you mean to just add another ground wire?
    #19
  20. Conlan Rose

    Conlan Rose Super Moderator

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    I have been tight on cash and need new tires so I have not yet gotten the new alternator, but I can easily elaborate on the upgrade grounds and alternator wire. Its called the big three upgrade normally what you do is replace you factory battery grounds with larger gauge cable and same with the alternator. This allows the extra current to flow better.

    Think about it like this: you have a large water storage tank(the battery), a water pump(alternator) and garden hoses going between the two(wires, cables). If you put a larger pump in but don't increase the size of the hoses the pump will suck them dry or push more water through them then they can handle.
    #20

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