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No High beams... need help

Discussion in 'Technical Chat' started by MyTaco, Aug 10, 2009.

  1. Aug 10, 2009 at 12:36 PM
    #1
    MyTaco

    MyTaco [OP] Well-Known Member

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    Guys, I have a 1994 pick-up. High beams work if you flash the switch but not in the on position...they just go out. I've replace head light relay, the light switch and still nothing. Any ideas and where on line can I find a wiring diagram?
     
  2. Aug 10, 2009 at 12:39 PM
    #2
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    Yep, one second.
     
  3. Aug 10, 2009 at 12:42 PM
    #3
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    http://www.ncttora.com/fsm/1993/index.html For a 93 but should be the same. I had the same issue with my 93. Replaced the relay and nothing. Turned out to be the switch inside the column. The contacts were corroded. I just took a small knife and scrapped it clean. Worked perfect ever since.
     
  4. Aug 10, 2009 at 12:45 PM
    #4
    MyTaco

    MyTaco [OP] Well-Known Member

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    BLHM, Grillcraft grill, painted grill and eyelids. 285/70/17 BFG's on 17x9 Pro Comps 5100's all corners
    Thanks for the link. I replace the column switch and still nothing. Is there anything else in the column i'm missing?
     
  5. Aug 10, 2009 at 12:47 PM
    #5
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    It's been a while (10 years) since I did that. I cannot remember.
     
  6. Aug 10, 2009 at 12:48 PM
    #6
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    I do see a dimmer switch the highs go through on the elec diagram. That could be it.
     
  7. Aug 10, 2009 at 12:48 PM
    #7
    MyTaco

    MyTaco [OP] Well-Known Member

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    No problem thanks again.
     
  8. Aug 10, 2009 at 12:51 PM
    #8
    MyTaco

    MyTaco [OP] Well-Known Member

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    I did see that. Ya think thats the dimmer knob on the dash for the dash lights cause thats the only dimmer i know of?
     
  9. Aug 10, 2009 at 12:51 PM
    #9
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    You replaced the one that is in the column? Not the switch on the end of the turn signal.
     
  10. Aug 10, 2009 at 1:10 PM
    #10
    MyTaco

    MyTaco [OP] Well-Known Member

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    I replaced the whole combination switch which included the turn signal and wiper switch. This mysterious dimmer switch....i dont think my 94 has one?
     
  11. Aug 11, 2009 at 6:33 AM
    #11
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    The dimmer switch is the one that is at the base of the turn switch (page BE-18). It is the switch that you activate to flash highs or go from low-high.
     
  12. Aug 11, 2009 at 7:30 AM
    #12
    MyTaco

    MyTaco [OP] Well-Known Member

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    Yeah, I replaced that already....I can flash high beams and the blue indicator light comes on but throw it in high beam mode and they go out....I'm at a loss.
     
  13. Aug 11, 2009 at 7:34 AM
    #13
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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  14. Aug 11, 2009 at 7:35 AM
    #14
    drew02a

    drew02a Rocking your mom's world Since 1997

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    A hypothesis:
    If it's not the switch, then maybe it's the power. When you pull back on the stick to flash your high beams the low beams stay on. I don't know how the lights are wired, but it's possible that your high beams are being power by the low beam circuitry. When you put the stick forward to keep your brights on, the power to the low beams is cut. You could easily test with a continuity tester, just disconnect the battery first.
     
  15. Aug 11, 2009 at 9:47 AM
    #15
    MyTaco

    MyTaco [OP] Well-Known Member

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    No it was off another truck. I hate to buy another new part and have it not work as you probably know you cant return electrical parts.

    Thanks for that explanation...guess I'll start probing!
     
  16. Aug 11, 2009 at 9:51 AM
    #16
    drew02a

    drew02a Rocking your mom's world Since 1997

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    Unless there's an ECV/ computer for the lights, just use a continuity tester and trace the circuit until you find the break.
     
  17. Aug 11, 2009 at 9:51 AM
    #17
    98tacoma27

    98tacoma27 :POOPCORN: Thor

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    Well, that switch could also be bad. the contacts corrode fairly easy. I would suggest disamntling the switch and looking.
     
  18. Aug 11, 2009 at 9:53 AM
    #18
    drew02a

    drew02a Rocking your mom's world Since 1997

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    You can also check the switch easily, again, with a continuity tester.

    Multimeters are pretty cheep and very useful :)
     
  19. Aug 11, 2009 at 10:17 AM
    #19
    MyTaco

    MyTaco [OP] Well-Known Member

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    08 Prerunner
    BLHM, Grillcraft grill, painted grill and eyelids. 285/70/17 BFG's on 17x9 Pro Comps 5100's all corners
    I'll try and get to it today. I'll post if and when I figure it out. Thanks again for all the help.
     
  20. Aug 13, 2009 at 3:41 PM
    #20
    MyTaco

    MyTaco [OP] Well-Known Member

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    08 Prerunner
    BLHM, Grillcraft grill, painted grill and eyelids. 285/70/17 BFG's on 17x9 Pro Comps 5100's all corners
    Turned out it was the switch...resistance was high. Strange that the other switch I tried did it too. Replaced it and all is well. Thanks again guys for your help.
     
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