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Thread: headlights go dim then slowly get bright again ANY IDEAS??

  1. #1
    Junior Member
    Join Date
    Sep 2008
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    3
    I have a 2003 lightning xb9s when im going down the road at a steady RPM the headlights get dim and slowly get bright again...Any info would be greatly appreciated...

  2. #2
    Senior Member
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    Aug 2008
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    5,146
    First, grab the '03 service manual by clicking the "Buell Service Manuals" link at the top of the page and save on your computer.

    Next, I'd check my battery terminals and Grounds that are handy to make sure they've not loosened up. Then I'd look up the Voltage Regulator in the Service manual. It's got a section on diagnosing & checking to make sure it's good.

    Good luck & post up if you're not running soon.

  3. #3
    Senior Member
    Join Date
    Oct 2008
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    144
    Also check connector 77, this connector seems to cause problems.

    I also suspect your charging system.

  4. #4
    Senior Member
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    Aug 2009
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    stv360, do you find the cause for that?mine seems to do the same!
    by the way, whats connector 77?

  5. #5
    Senior Member
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    Aug 2008
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    Voltage Regulator Connector - Bad Connector #77

  6. #6
    Senior Member
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    Jun 2009
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    184
    This sounds exactly like my bike. I also have an 03 and the lights were dimming. It was the battery, i guess they just need to be switched out after 6 years.
    I switched out my battery and the problem was gone.

  7. #7
    Senior Member
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    Aug 2009
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    101
    thanks stevenc, going to check that conector.
    My battery is new and reads 12,9V whith engine stopped.problem must be before the battery.

  8. #8
    Senior Member
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    Jul 2008
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    335
    Start the engine and put the meter back on the battery. It should read around 14v around 2k rpm. If not, its a problem with your charging system.

  9. #9
    Senior Member
    Join Date
    Aug 2009
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    101
    Finally it dies...couldn´t start the engine this afternon.
    As i it the start button i could ear the starter goes on and die, and on...,and on... ,the engine nothing!
    Seems like a bad starter relay or....no juice to feed it.Check voltage and 11,4v
    So remember to check conector #77 and it was melted
    I ride it this morning with a lot of fog and got home completely wet as well as the bike, so maybe this humidity finally killed that bad conector

    I´ve seen a DIY but only to clean the conector.

    Do i have to cut the wires to replace the conector?

    Apreciate any help

  10. #10
    Senior Member
    Join Date
    Jan 2009
    Location
    Portland, OR
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    3,485
    Tighten battery terminals



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