75 versus 90 amp alternator
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This is a discussion on 75 versus 90 amp alternator within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; does anyone know if the Sti Alternator (90 amp) will bolt right up to the WRX?...

  1. #1
    Banned dark_rex's Avatar
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    75 versus 90 amp alternator

    does anyone know if the Sti Alternator (90 amp) will bolt right up to the WRX?

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    Administrator Trainrex's Avatar
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    I could be wrong, but I believe all the mounting and plugs are identical, I think the only difference is the amperage. I have no concrete proof, so technically, I am worthless to this thread

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    That's a good question...I wonder if the extra amps would benefit those of us with various interior electronics
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    Administrator Trainrex's Avatar
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    I just looked it up in my Hollander interchange. It states the difference is the amperage.

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    Registered User djoye's Avatar
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    Hmm, if my alternator ever craps out I might consider the STi alt. Sometimes I'm sure I see my headlights dim when I press the brakes as if the extra draw from the brake lights creates the dimming, heh. The only extra electronic device in the car is the XEDE and a security system!
    2003 WRX 5MT sedan

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    Quote Originally Posted by Verdugo
    That's a good question...I wonder if the extra amps would benefit those of us with various interior electronics
    would definately help.
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    Registered User PolarisSnT's Avatar
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    Is it normal for the cars headlights to dim at idle and then when the revs raise the headlights brighten up? I used to think it was becuse my passenger side fog light was going out and then when it finally blew the dimming went away. Now after a couple weeks of driving with the fog lights off(havent replaced it yet and dont want only one fog light on) the dimming seems to have returned. Any thoughts?
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    Registered User GilliganLQ's Avatar
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    Quote Originally Posted by djoye
    Sometimes I'm sure I see my headlights dim when I press the brakes as if the extra draw from the brake lights creates the dimming, heh.
    I've noticed that when I have my heater set to windshield defog and the rear defroster is on, the headlights are always getting dimmer and brighter. It does it even while I'm driving at a constant speed. Does anyone know if the extra 15A output from the STi alternator would help or is this just something that's gonna happen regardless?
    Gilligan

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    WRX
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    wouldn't the grounding mod help with that too?
    13.12@101mph
    248whp 204lb/ft torque
    mods

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    "sitting in the corner in Rick Roll timeout" chanwahyaoh's Avatar
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    Quote Originally Posted by WRX
    wouldn't the grounding mod help with that too?
    Mine doesn't seem to.
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    Banned dark_rex's Avatar
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    the headlight dimming and interior lights dimming when other things are being used is precisely why i want to know.

    i'm researching some less expensive options for replacement than the subaru unit, and everything i see seems to match up.

    i just replaced my battery, and i wanted to be sure that's what the problem is. when i rev up, my morrettes get brighter, especially under load, so i figured it was the alternator.

    thanks for all the help guys.

    dR

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    Banned dark_rex's Avatar
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    Quote Originally Posted by Trainrex
    I just looked it up in my Hollander interchange. It states the difference is the amperage.
    meaning there are no other differences?

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    Banned dark_rex's Avatar
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    subaru part numbers:
    2002 WRX 23700AA430
    s004 STI 23700AA540

    subaru doesn't have remanned STi alternators, so it's like $470 the WRX model is $229.

    PPR makes a 90 amp WRX rebuilt but i'm getting conflicting part numbers... it's either
    SUB082124 as listed by a reseller
    http://catalog.masterautoparts.com/i...rillid=9&image

    or

    SUA109 as listed by PPR
    http://www.pprok.com/pweb/c/wcp?v_md...reza)&v_type=A


    I've never heard of PPR, so i'm working on getting numbers and prices for Brands like ProPlus, USA, ACDelco, etc. hopefully i'll be able to cross them over.

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    Administrator Trainrex's Avatar
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    Quote Originally Posted by dark_rex
    subaru part numbers:
    2002 WRX 23700AA430
    s004 STI 23700AA540

    subaru doesn't have remanned STi alternators, so it's like $470 the WRX model is $229.

    PPR makes a 90 amp WRX rebuilt but i'm getting conflicting part numbers... it's either
    SUB082124 as listed by a reseller
    http://catalog.masterautoparts.com/i...rillid=9&image

    or

    SUA109 as listed by PPR
    http://www.pprok.com/pweb/c/wcp?v_md...reza)&v_type=A


    I've never heard of PPR, so i'm working on getting numbers and prices for Brands like ProPlus, USA, ACDelco, etc. hopefully i'll be able to cross them over.
    I get the feeling the PPR listing is outdated. I'm listing all Impreza alternators the same from 02-05 with the exception of the STI which is higher amperage. Unfortunately, that's all it tells me

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    Banned dark_rex's Avatar
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    i have a number for an aftermarket part. it wasn't easy to find, but it sure beat the gaffe job of buying a dealer part.

    odd part is, the amperage isn't listed. i even spoke with the rep from the company, and he's at a loss. my guess is it's 75, but there's a chance that it's 90 so the company won't have to retool 2 alternators with the same bolt pattern on the case.

    it arrives friday, and hopefully will end my electrical woes.

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