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Thread: 03' RT Headlight Fuse?

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    03' RT Headlight Fuse?

    Does the 03' RT headlights have fuse or circuit breaker protection? I've been looking at Doug Raymond's ladder wiring diagram and it appears the headlights are powered directly from the load relief relay.
    Ken S
    03 R1150RT

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    Quote Originally Posted by nosvamos View Post
    Does the 03' RT headlights have fuse or circuit breaker protection? I've been looking at Doug Raymond's ladder wiring diagram and it appears the headlights are powered directly from the load relief relay.
    no definitive answer, but I can not think of a bike that has the headlight on a fuse. it really does not make a lot of good sense to do so, unless you consider a headlight to be an "accessory".
    Ride Safe, Ride Lots

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    Pepperfool GSAddict's Avatar
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    No it is not.

    No oilheads are.

    Yes it is has caused many a melted harness.

    The ignition switch circuit is also unfused.
    Basically stupid design by BMW.
    Years ago I confronted BMW Canada regarding this and initially they denied the fact, when I referred them to the factory OE wiring diagrams and walked them thru their comeback was "we have never had an issue"
    History has proved them wrong.
    The most common failure has been caused by sloppy wiring practices when inmates add HID lighting on their GS's - shorts inside the lampholder.
    Others by chafing or poor accessory installation as well as upsizing to 100w lamps.
    I have modified several bikes now (including mine years ago) by adding a 20A fuse to the Load relief circuit and a 10A fuse in the Ignition switch circuit.
    There are several threads on how to do this mod. on this forum as well as ADV riders.


    http://www.bmwmoa.org/forum/showthre...ectrical-issue
    http://m583.photobucket.com/albums/G...%20Fuse%20Mod/
    http://advrider.com/forums/showthread.php?t=665648

    FYI: the F650's have unfused circuits as well, I have redone & fused the harness on one of those as well.
    '
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    It's all about the details.

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    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by bikerfish1100 View Post
    no definitive answer, but I can not think of a bike that has the headlight on a fuse. it really does not make a lot of good sense to do so, unless you consider a headlight to be an "accessory".
    Just about every Japanese bike I have worked on has had the headlights fused.
    '
    Ufda happens..........

    It's all about the details.

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    Registered User lkchris's Avatar
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    Just about every GERMAN vehicle you'll encounter--car or bike--will NOT have a fused headlight. Since Bosch essentially invented automotive electrics I'd vote posters here not qualified to call this stupid.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

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    Lucky motorradmike's Avatar
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    Quote Originally Posted by lkchris View Post
    Just about every GERMAN vehicle you'll encounter--car or bike--will NOT have a fused headlight. Since Bosch essentially invented automotive electrics I'd vote posters here not qualified to call this stupid.
    Perhaps so, but perfected by Lucas Electric.
    Mike Marr
    1978 Yamaha XS750 (Needs rings), 1996 BMW R1100RS, 2004 Honda CRF230F

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    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by lkchris View Post
    Just about every GERMAN vehicle you'll encounter--car or bike--will NOT have a fused headlight. Since Bosch essentially invented automotive electrics I'd vote posters here not qualified to call this stupid.

    I have 36 years in Industrial electrics and process controls with lots of marine and auto/motorcycle work.
    Unfused wiring IS stupid.
    I have seen the results time and time again.
    Just to save $,02

    BTW: Audi, BMW and VW DO fuse their headlight circuits. Newer models that don't show fuses have electronic circuit protection. This includes the R1200 hexhead bikes.
    '
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    It's all about the details.

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    Registered User roger 04 rt's Avatar
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    See the fuses for high and low beam circuit on the 2004 R1150RT.

    http://www.mac-pac.org/wp-content/up...agram-V1_1.pdf

    Fuse 8 Low Beam
    Fuse 9 High Beam

    Tested and confirmed on my motorcycle.

    RB
    Last edited by Roger 04 RT; 06-18-2013 at 07:38 PM.

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    Quote Originally Posted by Roger 04 RT View Post
    See the fuses for high and low beam circuit on the 2004 R1150RT.

    http://www.mac-pac.org/wp-content/up...agram-V1_1.pdf

    Fuse 8 Low Beam
    Fuse 9 High Beam

    Test and confirmed on my motorcycle.

    RB
    Please refer to the OE wiring detail, you will find it is indeed unfused like all the other models.
    If you don't believe me pull out all the fuses. Turn on the ignition switch and you will have the headlight come on.
    '
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    It's all about the details.

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    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by Roger 04 RT View Post
    See the fuses for high and low beam circuit on the 2004 R1150RT.

    http://www.mac-pac.org/wp-content/up...agram-V1_1.pdf

    Fuse 8 Low Beam
    Fuse 9 High Beam

    Test and confirmed on my motorcycle.

    RB
    Doug Raymond's schematics show F8 is for the radio. GSAddicts original OEM drawings (yes he bought them from BMW) show the same thing. The high and low beam are wired directly to the load relief relay. No fuses for the headlight are present on either set of drawings.

    I don't think there is a fuse on the headlight. How did you test this Roger?

    Pundit disclaimer: I'm not GERMAN but I am a certified electronics tech (amoungst other things) so don't bother with the what the heck do you know about anything stuff. Sheesh...
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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    Registered User roger 04 rt's Avatar
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    HW, Click on the link in my message and you'll see the fuses on page 3. RB

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    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by GSAddict View Post
    Please refer to the OE wiring detail, you will find it is indeed unfused like all the other models.
    If you don't believe me pull out all the fuses. Turn on the ignition switch and you will have the headlight come on.
    On the 2004 twin spark, the fuses are there and do just what it says on the schematic. I did check it before posting being untrusting as I am.

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    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by Roger 04 RT View Post
    On the 2004 twin spark, the fuses are there and do just what it says on the schematic. I did check it before posting being untrusting as I am.
    Did you actually try it? IE removing all the fuses?
    '
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    It's all about the details.

  14. #14
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by GSAddict View Post
    Did you actually try it? IE removing all the fuses?
    Turned the lights on, one at a time, pulled the fuses, one at a time ...

    Edit: I provided Doug with the info to do the dual-spark schematic since I have the disks.

  15. #15
    Day Dreaming ... happy wanderer's Avatar
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    I see what is going on here. Doug Raymond has released several versions of the 1150RT schematics.

    R1150RT_Elec_Diagram-v1_1.pdf
    R1150RT_Elec_Diagram-v2.pdf
    R1150RT-Electric-Diagram-V3.1.pdf

    and now

    R1150RT-2-Plug-Elec-Diagram-V1_1.pdf
    which is for the twin spark R1150RT

    Now we all know the company line that there have "never been any issues" but even so, it seems BMW decided to fuse the headlights on the twin spark 1150 according to Doug Raymond's schematic for that model. Lucky you! You got fuses.
    Not that you will _ever_ need them eh?
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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