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Need help with wiring an alternator...

Discussion in 'The Garage' started by Poohbair, Feb 9, 2006.

  1. Poohbair

    Poohbair 1/2 ton status

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    My buddy swapped a 94ish LT1 in his FJ 40, and has an aftermarket harness for the wiring. He cant seem to get the alternator to charge the battery, so we are looking for a little advise on where to wire these things to. None of the wiring diagrams have the same color wires as what he has. The alternator plug only has 3 female connectors, but the alternator has 4 male prongs...?

    The alternator is of the hi-amp option, or so he was told by the wrecker he bought it from. The wire labels for the alt plug (from top largest wire down in the picture) are: S F L P (P doesn't have a wire, but there is a prong in the alternator for one).

    Anyone know how to wire this bitch?



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  2. goldwing2000

    goldwing2000 Guest

    Yank it out and trade it in for a two-wire plug! :D

    I would guess S is signal and F is field but I can't think of anything for L. Load? Those alts only came on computer-controlled cars, so it may not work without the right ECM.

    Have you tried a google search?
     
  3. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    something to search here is the pontiac trans sport upgrade... same alternator... I couldnt get it working in my truck, however I believe I may have a bad alt from the junkyard..... but will be revisiting this soon....
     
  4. neverendingproject

    neverendingproject 1/2 ton status

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  5. neverendingproject

    neverendingproject 1/2 ton status

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    red goes to hot, white goes to guage, big bolt on back of Alt goes to battery
     
  6. goldwing2000

    goldwing2000 Guest

  7. dyeager535

    dyeager535 1 ton status Premium Member

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    So in other words, the wires can be cut and spliced with the connector he already has. That picture is perfect. :)
     
  8. Dallin

    Dallin 1/2 ton status

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    The alternator is a CS144. It doesn't need a computer.

    S terminal is the sense wire. Hook it up to the positive battery terminal or after one of the fusible links.

    L terminal turns the alternator on. It needs a 35 to 300 ohm resistor in the line and should be switched on with the ignition. You could use a small lightbulb in place of the resistor.

    You probably won't need to mess with the other terminals.
     
  9. Poohbair

    Poohbair 1/2 ton status

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    Sweet guys, thanks for the info... he is trying to get this thing up and running by next weekend to go wheelin!

    Here is a kinda old pic of what the engine is in...It is alot more put together now!

    [​IMG]
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  10. afroman006

    afroman006 1/2 ton status

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    So lets revisit this, I just got one for my 6.2 truck. I went to napa and bought a pigtail for it, with three wires, on is larger (about 12 or 10 gauge) and red, and the other two are around 16 gauge and one is brown and the other is white I think. So it soungs like the large red wire loops around to the screw terminal on the back of the alternator but I am not clear on how the other two leads hook up.
     
  11. Dallin

    Dallin 1/2 ton status

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    You've got the red wire figured out. Wire the white wire to a ignition switched source with a 30 to 300 ohm resistor in the line or a light bulb. Don't use the brown wire.
     
  12. afroman006

    afroman006 1/2 ton status

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    Good deal, thanks.
     
  13. HarryH3

    HarryH3 1 ton status Author

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    Holy big pictures Batman! :shocked: Check out www.irfanview.com for some sweet FREE software for resizing pics. :)
     
  14. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    hellz all ya need to do is use mspaint :haha:
     
  15. goldwing2000

    goldwing2000 Guest

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