3g Alt Question

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by TOOLOW91, Sep 25, 2013.


  1. TOOLOW91

    TOOLOW91 Mustang Master

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    Yes I am just full of questions

    Did the swap , very happy with it except at idle it dips to about 12.5 v , I notice the pulley is bigger on the 3G . if I swap my fox pulley do we feel it would help ?

    4ga wiring from alt to Solonoid with fuse as well



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  2. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    is it the 1 wire version with internalregulator? Those require a bit of rpms to get them "started"
  3. TOOLOW91

    TOOLOW91 Mustang Master

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    no sir has the same connections as reg 3 g the reg is on the back 3 wires

    the white goes from the big connector to the small square one , green to green yellow to yellow and then my 4ga


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  4. revhead347

    revhead347 I have face herpes.

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    Yes, swapping the pulley will help keep the alternator up to speed.

    Kurt
  5. TOOLOW91

    TOOLOW91 Mustang Master

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    [​IMG]


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  6. TOOLOW91

    TOOLOW91 Mustang Master

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    Thanks that's what I figured but wanted an opinion


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  7. Mustang5L5

    Mustang5L5 Car used in adult film "Highway Gangbang-InDaButt" SN Certified Technician Founding Member

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    Yes, swap the pulley.

    You'll need a 5/8 ID washer to act as a spacer. You'll see what I mean when you try to slip the 2G pulled onto the shaft.
    Last edited: Sep 26, 2013
  8. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    that smaller pulley should fix you up
  9. 85rkyboby

    85rkyboby Active Member

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    If you put a smaller pulley on a 2g will it overheat and burn up?
  10. mikestang63

    mikestang63 Mustang Master

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    no. I run a over drive 1 11/16 pulley. People have been doing this mod for years with no problem.
  11. MikeH686

    MikeH686 Mine is only two inches though.

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    Yeah the pulley change will help im running 14.4v at idle
  12. TOOLOW91

    TOOLOW91 Mustang Master

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    use it on the back side because it will sit to close to the case ??


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  13. Mustang5L5

    Mustang5L5 Car used in adult film "Highway Gangbang-InDaButt" SN Certified Technician Founding Member

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    Yup.

    If appearance is an issue, ASP makes compatible alternator pulleys of various finish. Diameters are 1 7/8", 2" and 2.5".
  14. TOOLOW91

    TOOLOW91 Mustang Master

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    Got it will do it tomorrow thank you !
  15. Mustang5L5

    Mustang5L5 Car used in adult film "Highway Gangbang-InDaButt" SN Certified Technician Founding Member

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    Just to clarify, the 5/8" is the ID. That's the shaft diameter so the washer would slide on.

    Just don't want anyone to buy a 5/8 OD washer!
  16. TOOLOW91

    TOOLOW91 Mustang Master

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    I assumed LMFAO . I will grab one tomorrow at work Thank you again pal
  17. 85rkyboby

    85rkyboby Active Member

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    Alright cause my Power Master is low at idle and about 12.9 or so when I'm driving.
  18. Mustang5L5

    Mustang5L5 Car used in adult film "Highway Gangbang-InDaButt" SN Certified Technician Founding Member

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    When you rev the engine it's still 12.9? Might be a voltage regulator issue. Should have 14v above idle.
  19. 85rkyboby

    85rkyboby Active Member

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    I thought so as well but I had it tested its fine. Its internal. I'm just thinking its cause my underdrive pulley
  20. mikestang63

    mikestang63 Mustang Master

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    yep. ditch the U/D alt pulley as it's probably 2 1/2" and is meant to slow the alt- not good. . I bought the March overdrive pulley off Flea bay.. Sorry don't remember the PN off hand but it made a big difference. You can see it in my sig pic.

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