Odd headlight issue

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by bloc, Oct 25, 2012.

  1. bloc

    bloc Been here awhile

    Joined:
    Apr 29, 2012
    Oddometer:
    158
    Location:
    Austin, TX
    I apologize if this has been brought up before.. I've spent hours looking at wiring diagrams and searching the forums.. not really sure what phrases to use though.

    2004 950 Adventure S, euro headlight, no euro light switch.

    Intermittently for a while, and now permanently, the headlamp will not come on (regular or high-beam), but the blue high-beam indicator on the dash is staying lit. Doesn't matter what combination of settings you use for the high/low-beam, or high-beam flasher.. condition persists. All fuses good, both the switches seem to be operating correctly. (EDIT: I took the switches apart and no burned contacts, no dirt.. everything seemed fine)

    Other than that, the bike starts and runs flawlessly.

    Has anyone seen this before? Any ideas for things to check before I start ripping apart the fairings and attack it with a DMM?

    Thanks,
    -Justin
    #1
  2. baloneyskin daddy

    baloneyskin daddy bikaholic

    Joined:
    Oct 21, 2009
    Oddometer:
    2,364
    Location:
    southcentral PA.
    Is it a single bulb set up? If it is the filements are touching each other.
    #2
  3. bloc

    bloc Been here awhile

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    Apr 29, 2012
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    158
    Location:
    Austin, TX
    Euro light assembly, separate H3 & H7 bulbs.
    #3
  4. AdvRonski

    AdvRonski They call me......Ronski

    Joined:
    Feb 4, 2007
    Oddometer:
    817
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    Finally made it to Fruita!
    Sounds like a problem with the ground circuit.
    #4
  5. bloc

    bloc Been here awhile

    Joined:
    Apr 29, 2012
    Oddometer:
    158
    Location:
    Austin, TX
    With the high-beam indicator lighting up, and seemingly independently of the high/low beam settings, it made me wonder if this was some kind of diagnostic or warning light. From looking at the wiring diagrams I can't work out how it would turn on with from a wiring fault unless the dash was doing it for some other reason..

    I wish I could find a schematic of the dash.. that would help a ton.
    #5
  6. AdvRonski

    AdvRonski They call me......Ronski

    Joined:
    Feb 4, 2007
    Oddometer:
    817
    Location:
    Finally made it to Fruita!
    The reason the high-beam indicator is on regardless of high/low setting, is that without a good ground, the low-beam setting will feed through the high-beam filament, and light the indicator. In high-beam, the indicator is powered directly.
    Check that ground circuit!
    #6
  7. bloc

    bloc Been here awhile

    Joined:
    Apr 29, 2012
    Oddometer:
    158
    Location:
    Austin, TX
    Thanks for the explanation.. I'll check into it tomorrow.
    #7
  8. bloc

    bloc Been here awhile

    Joined:
    Apr 29, 2012
    Oddometer:
    158
    Location:
    Austin, TX
    AdvRonski, you called it. The female ground wire pin in the main headlight connector was slightly loose and showed signs of getting a little hot as a result.

    Thanks for the help.
    #8