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96 taco only high beams no low beam

Discussion in '1st Gen. Tacomas (1995-2004)' started by Jmd4993, Sep 16, 2020.

  1. Sep 16, 2020 at 2:03 PM
    #1
    Jmd4993

    Jmd4993 [OP] New Member

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    jared
    Vehicle:
    96 tacoma 5 spd 4x4
    low beams suddenly turned off one night and only high beams work.

    bought a two new all inclusive headlights and no difference replaced all fuses
    Put power probe on headlight plug and got 12.5v for all three
    dashboard light indicator comes on with low beam actuation and highbeam
    relay clicks as i turn on low beams as well

    stumped any help is greatly appreciated
     
  2. Sep 16, 2020 at 2:07 PM
    #2
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
    Welcome aboard Jared
     
  3. Sep 16, 2020 at 2:31 PM
    #3
    Jmd4993

    Jmd4993 [OP] New Member

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    thanks
     
  4. Sep 16, 2020 at 6:12 PM
    #4
    Wsidr1

    Wsidr1 Well-Known Member

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    This looks like a question for @RysiuM
     
  5. Sep 16, 2020 at 8:07 PM
    #5
    TnShooter

    TnShooter Well-Known Member

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    My understanding is that Dimmer Switch supplies ground for the High and Low beams.
    Sounds as if the Low Beam ground is not being supplied?
    Then again, I could be wrong.
    Maybe someone with a REAL diagram can help you out.
     
  6. Sep 17, 2020 at 8:40 AM
    #6
    RysiuM

    RysiuM Well-Known Member

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    Was Golden State, now Poland EU
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    1995 4x4 LX Ext Cab, I4 2.7, MT, 320K miles
    DD Deck+backup camera, LED DRL, All LED except H4 Hella
    @Jmd4993 did not say if he has DRL (Canadian) truck or not, so I assume it is not. For non-DRL truck the diagram with highlighter path (in blue) for low beam (from the bulb to the ground).

    upload_2020-9-17_8-15-56.jpg

    Basically when low beam it turned on the blue path should show zero volt and therefore the high beam indicator bulb will be off. The only way the high beam indicator bulb will stay on is if head relay is powered, at least one headlight has working low beam filament AND the dimmer switch does not short "blue line" to the ground. I can eliminate the switch ground issue as if there is a ground problem then the high beam would not work nor the headlight relay would not energize (the the high beam indicator bulb would not turn on). My bet the broken part is a dimmer switch, particularly the wire connector 17 (where the read/green wire is going into the switch). It is quite common issue with older trucks (It is Toyota design flaw imho) because that wire is under constant high current flow when driving at night. Like here: https://www.tacomaworld.com/threads/low-beams-dont-work-high-beams-do.628133/#post-21515244

    This is why you should never use high power headlight bulbs (known as "off road" bulbs) without additional harness. And this is one of the reasons I installed LED road legal DRL lights in my truck (DRL or driving with low beam on are required in Poland).
     
    Wsidr1 likes this.

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