Headlight Burning Out Excessively...

Discussion in 'General Harley Davidson Topic' started by Glider-Rider, May 3, 2011.

  1. Glider-Rider

    Glider-Rider Member

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    I have an 08 fxdc and just burned out my 3rd. HD headlight, and 1 after market light. I always have my brights on during the day for better visability. I have had the electrical system checked and everything was ok. I'm at a loss. Does anyone have any suggestions? Any help would be greatly appreciated!
     
  2. glider

    glider Veteran Member

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    Is there any signs of melting on the plug for the light? Could be a bad connection.
     
  3. Hoople

    Hoople Account Removed

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    You have gone through (4) H-4 replacement bulbs? Three of which were HD brand?
     
  4. bc45

    bc45 Active Member

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    Could You be touching the glass part of the bulb? if you touch the glass your finger prints will etch the glass and shorten bulb .
     
  5. Blue Wide Glide

    Blue Wide Glide Junior Member

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    Excess vibration at certain speeds will cause the bulbs to fail. I was constantly replacing the left passing lamp bulb in my Springer, never the right, only the left.
     
  6. TripleJ

    TripleJ Senior Member

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    Exactly what I was thinking.
     
  7. Glider-Rider

    Glider-Rider Member

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    Always been very careful not to touch the bulb. I have gone through (3) H-4 replacement bulbs and 1 after market and I's getting ready to put in a new bulb. There has not been any sign of overheating, scorching, or melting.
     
  8. HarryB737

    HarryB737 Junior Member

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    Check to make sure your headlight is also tight. Seems to me there was an issue with some rivets coming loose on one model, but I don't remember which one it was. Also I always use bulb grease in the terminal to assure no looseness and good continuity there. I've had good luck with Sylvania "LL" Long life bulbs, they may be constructed around a little higher voltage rating, which will allow longer life also.
     
  9. Hoople

    Hoople Account Removed

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    I know that's what they told you, but I would place a voltmeter across the battery and hold an RPM of ~ 3200 and see what the peak voltage is. Check to see what it is yourself. Try to use a quality meter on the 20 volt scale in order to read to 2 places..
     
  10. TXMikey

    TXMikey Junior Member

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    I have similar issues on my 08 Streetglide. It always burns out the high beam filament, never the low beam. Since I run my high beam during the day, I was thinking the high beam filament just has a shorter lifespan because of the higher wattage it carries. It is a frustrating, and expensive, issue having to replace the bulb so often.