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  1. #1
    P Monk
    Join Date
    May 2005
    Location
    Orange, Texas
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    794

    Canbus blues

    since my 09 gs was totaled by Harvy, I have bought a 2011 R1200RT. I installed a Givi 56 liter trunk on it with led light kit. Cannot get the leds to light up.
    I was surprised to see only one wire going to the tail light and brake light. Actually appears to be one hot wire and one ground to each of two bulbs. Not wanting to cut or splice wires, used a spade connection splitter to connect wiring to the led's in the trunk. I only read 3 volts at the givi lid. All I really want the lights to do is be on as extra running lights and would appreciate any suggestions. Am thinking I should find a wire such as one for an accessory plug to use to power the lights.
    P. Monk
    74 R90/6 (the Black Hole) Harvey couldn't kill it. . 09 R1200 GS, drowned in Harvey replaced by 2011 R1200RT. Wife, 1953 model survived aplastic anemia and a bone marrow transplant.

  2. #2
    Are they possibly just dim? I put a 5 LED array on one of my bikes and it only lit up dimly. I wired a second one in series and then had 10 bright LEDs.

  3. #3
    Registered User
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    May 2007
    Location
    Western NY
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    364
    It's not the CAN bus, but the way the tail and brake lights are controlled. The same filament is used for both functions. As a tail light the bulbs receive a pulse modulated signal; 12 volts on, 12 volts off, etc. The average voltage depends on the on/off ratio, but will be less than 12 volts, resulting in a dim bulb. When the brakes are applied the bulbs receive a steady 12 volts and light up at their brightest.
    Karl
    2007 R1200ST

  4. #4
    Registered User
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    Lanark County near Ottawa ON
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    Quote Originally Posted by kthutchinson View Post
    It's not the CAN bus, but the way the tail and brake lights are controlled. The same filament is used for both functions. As a tail light the bulbs receive a pulse modulated signal; 12 volts on, 12 volts off, etc. The average voltage depends on the on/off ratio, but will be less than 12 volts, resulting in a dim bulb. When the brakes are applied the bulbs receive a steady 12 volts and light up at their brightest.
    Definitely not the CANbus since it is a Controller Area Network and thus a communications medium and not anything that powers tail light bulbs!

    Sent from my SGH-I747M using Tapatalk

  5. #5
    P Monk
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    not canbus

    thanks for the explanation Karl. I didn't know how a single filament bulb could be both running and brake light. So the tail light is not the place to provide electricity to the led's unless they can also operate on the on/off cycle like the incandescent bulb does? I obviously am more in my element working on my airhead.
    P. Monk
    74 R90/6 (the Black Hole) Harvey couldn't kill it. . 09 R1200 GS, drowned in Harvey replaced by 2011 R1200RT. Wife, 1953 model survived aplastic anemia and a bone marrow transplant.

  6. #6
    Rocky Bow BMW Riders #197 bogthebasher's Avatar
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    Apr 2008
    Location
    Calgary AB
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    1,519

    Here is how I wired Admore LED kit to Givi Topbox

    Like many others I have used the rear power socket for the single Brake/Tail light switched power source for additional Givi Top Box lighting in my 2008 R1200RT.

    Comparing information from my Haynes Manual and the Admore Kit I have put this connection map together; I used Grey (Gry) for grey instead of Slate for that colour name:

    Light -------------------- RT Wire --------- Admore
    Rear Left Turn Signal-------Vio/Red/Yel------ Yel
    Brake/Tail Lights----------- Gry/Blk/Yel------ Red
    Rear Right Turn Signal----- Vio/Brn/Wht----- Grn
    Battery Negative----------- Brn--------------- Blk (called Ground)
    Ignition 12V Switched------ Vio--------------- Blu*

    Admore states that:
    *Blue wire must be connected to continuous (switched) 12V to operate the embedded mini controller. For motorcycles with a single brake/tail light wire, connect the Blue wire to a 12V source switched with the ignition. Connect the Red wire to the single brake/tail wire.

    Notes
    Applying the brakes sends a continuous 12V to the LED to cause it to operate at full brightness. When no brakes are applied, the bike's ZFE controller sends a Pulse Width Modulated signal to the lamp... 12V for about 3 milliseconds, then no power for about 9 mS. This repeats endlessly, resulting in the lamp glowing at partial brightness.
    Last edited by bogthebasher; 10-15-2017 at 02:17 PM.
    Ken Dittrick
    2008 R1200RT (Biarritz Blau)

    Excuses are the rocks upon which our dreams are crushed - Tim Fargo

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