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MR2 alternator swap on 3.4 swap

Discussion in '1st Gen. Tacomas (1995-2004)' started by 1998triton, Aug 16, 2015.

  1. Aug 16, 2015 at 5:11 PM
    #1
    1998triton

    #1
    1998triton [OP] Well-Known Member

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    i have a 1998 tacoma with 3.4 v6

    my alternator just went out. i bought a 1991 mr2 alternator and did a swap. alternator is not charging. anyone know the the wiring for the swap might have wires wrong? any suggestions would be great

    thanks
     
    1998triton, Aug 16, 2015
    #1
  2. Aug 16, 2015 at 5:13 PM
    #2
    TrdSurgie

    #2
    TrdSurgie revised

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    Sometimes those rebuilt alternators are crap out the box.
     
    TrdSurgie, Aug 16, 2015
    #2
  3. Aug 16, 2015 at 5:14 PM
    #3
    1998triton

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    1998triton [OP] Well-Known Member

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    i do agree i am hoping that is it but i want to make sure the wiring is correct
     
    1998triton, Aug 16, 2015
    #3
  4. Aug 17, 2015 at 12:44 PM
    #4
    1998triton

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    1998triton [OP] Well-Known Member

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    Bump
     
    1998triton, Aug 17, 2015
    #4
  5. Aug 18, 2015 at 7:32 AM
    #5
    Caligula

    #5
    Caligula Well-Known Member

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    alternator is not charging?
     
    Caligula, Aug 18, 2015
    #5
  6. Aug 18, 2015 at 8:29 AM
    #6
    1998triton

    #6
    1998triton [OP] Well-Known Member

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    Is not charging the battery
     
    1998triton, Aug 18, 2015
    #6
  7. Aug 18, 2015 at 2:43 PM
    #7
    Caligula

    #7
    Caligula Well-Known Member

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    Should be easy enough to diagnose. Get a multimeter, check voltage from output, check diodes.
     
    Caligula, Aug 18, 2015
    #7
  8. Aug 18, 2015 at 2:51 PM
    #8
    1998triton

    #8
    1998triton [OP] Well-Known Member

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    I figured it out. Alternator straight out of the box bad. Good ol parts stores
     
    1998triton, Aug 18, 2015
    #8
  9. Aug 21, 2015 at 12:40 PM
    #9
    1998triton

    #9
    1998triton [OP] Well-Known Member

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    After 3 alternators finally got one that is good. Just went with a stock one. I have a new problem now. When you turn on headlights or roll up windows the truck dies. New alternator, batter is good, new 80 amp alternator fuse and the 7.5amp is good

    Any ideas?????
     
    1998triton, Aug 21, 2015
    #9
  10. Aug 21, 2015 at 2:14 PM
    #10
    Caligula

    #10
    Caligula Well-Known Member

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    Would think a short from the window or headlight circuits. Thats weird. Maybe issue with charging circuit.
     
    Caligula, Aug 21, 2015
    #10

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