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Thread: low voltage to tail light

  1. #1

    low voltage to tail light

    I have a 2011 F650 gs, single cylinder with 5500 miles. I was riding it, hit a major bump and the entire rear fender broke off. The three wires to the tail light unplugged themselves and looked undamaged but, after replacing parts, I find I am only getting about 6 volts through them. Any ideas before I start pulling body panels etc.? TIA

  2. #2
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    May be correct. If the running light looks good and it gets brighter when you hit the brake lever, I think you are good to go.
    Let us know.
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  3. #3
    Registered User
    Join Date
    Aug 2018
    Fargo, ND
    BMW uses pulse wave modulation for tail lights on many of the recent models. In layman's terms, the ECM sends a pulse, on and off rapidly, to the tail light for running lights, and full battery voltage for brakes. It will show 5-6 volts under normal conditions and full 12 volts, (14 volts running) with the brakes applied.
    From the only real Fargo, ND!

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