Author Topic: Tail / Brake Light Bulbs  (Read 226 times)

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OfflineOur Gee

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    Tail / Brake Light Bulbs
    « on: 2017-09-19 10:05:15 »
    Hello all,
    Sorry if this has been discussed before but here goes. I am in the process of putting together a "spare bulb kit" for our Twincam and it does seem to be a bit confusing, well to my rusty brain it does !!. (BMW no longer do a dedicated model specific Kit)
    According to my Rider's Manual the bulb for the Tail light / Brake light is a P21W / 12V / 21W which I assumed would mean a Twin Filament Bulb. So with that in mind I have trawled various BMW parts suppliers Web Sites such as Motorworks, Motobins and Sherlocks and it only gets more confusing. In the end I removed the rear light cluster to see just what Tail / Brakelight bulbs are fitted. Now for the surprise. It would appear that the bulb is a "Single Filament" type which operates at two different current inputs, the lower current for the rear light and the higher current for a combined rear light and the Rear Brake. I have never come across this before. Anyone else noticed this ?.
    « Last Edit: 2017-09-19 11:09:28 by Our Gee »

    Offlinesimbo

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    • Country: gb
      • Model/year: R1200RT 2011
      Re: Tail / Brake Light Bulbs
      « Reply #1 on: 2017-09-19 12:13:43 »
      Yeah I was surprised too, especially as I'd bought two twin filament bulbs to replace them both when one went.  :eggs:
      2011 BMW R1200RT, 2015 H-D StreetBob SE, 2016 Suzuki VanVan, 2003 GasGas 200TXT Pro, 2007 V-Strom 650..

      Offlinebeemerboy9

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      • Country: gb
        • Model/year: R1200RT 2014
        Re: Tail / Brake Light Bulbs
        « Reply #2 on: 2017-10-11 23:52:12 »
        Hello all,
        Sorry if this has been discussed before but here goes. I am in the process of putting together a "spare bulb kit" for our Twincam and it does seem to be a bit confusing, well to my rusty brain it does !!. (BMW no longer do a dedicated model specific Kit)
        According to my Rider's Manual the bulb for the Tail light / Brake light is a P21W / 12V / 21W which I assumed would mean a Twin Filament Bulb. So with that in mind I have trawled various BMW parts suppliers Web Sites such as Motorworks, Motobins and Sherlocks and it only gets more confusing. In the end I removed the rear light cluster to see just what Tail / Brakelight bulbs are fitted. Now for the surprise. It would appear that the bulb is a "Single Filament" type which operates at two different current inputs, the lower current for the rear light and the higher current for a combined rear light and the Rear Brake. I have never come across this before. Anyone else noticed this ?.
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