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Thread: Moto-Gadget M-Unit/Blue with B-button - '89 R100GS

  1. #1
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    Moto-Gadget M-Unit/Blue with B-button - '89 R100GS

    Been working to clean up a GS over the winter... pretty much everything needs attention.

    Decided to go with a M-Unit Bluetooth with the M-Button to simplify the overall wiring on the bike. Yes a bit expensive but cool!

    I kept all the BMW switch gear.

    Left:
    Lights:
    - used the flash feature of the switch only.
    - Low after bike starts
    - quick tap - High Beam
    - long hold - headlight OFF
    Blinker: As usual - but time out after 45sec - configurable. Also they are set-on as markers @ 20% when the blinkers are not active
    Horn: as usual

    Right:
    - Kill switch - wired to cut out ignition, oil lamp, Gen lamp and Neutral ... did so I could tell whether or not the ignition is live
    - start button
    - single tap - Start
    - double tap - disable ignition - hitting start re-enables ignition

    Clutch - Wired to the "stand" input - this prevent activation of the Starter without the Clutch Lever pulled in.
    All the other switches were used as stock.

    Attached is my schematic and install.

    I also have updated to Aplha Ignition and Omega 600W stator and diode
    Attached Images Attached Images
    Last edited by grahamm; 02-10-2018 at 03:34 PM.
    '81 R80G/S(wp4860 forks, Henderson triple clamp)
    '10 Husaberg FE450, '10KTM 250XC-W
    Past BMWs: '68 R50/2, '77 R80/7, '87 R80GSPD, '76 R60/6, '85 K100RS, '91 R100GS,'87 R100RS

  2. #2
    Congrats. Incredible workmanship and documentation.
    Lee A. Dickinson - Danielsville, GA USA
    MOA 80364 | RA 29650 | ABC 3480 | IBA 8914
    1976 R75/6 - 1992 R100RS - 1993 K1100RS - 2013 R1200GS

  3. #3
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by beemerphile View Post
    Congrats. Incredible workmanship and documentation.
    +1
    I don't know anything about it but I know when an install/wiring looks good
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  4. #4
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    I posted same in the Facebook airheads group and concerns over a non-shielded M-button to M-unit connection were raised. So, while I have time, I will rewire the green wire from the m-button with a shielded twisted pair for the green wire and it's ground, shield will be terminated at the M-unit ground.

    concern is over electrical noise generated from the coil...
    '81 R80G/S(wp4860 forks, Henderson triple clamp)
    '10 Husaberg FE450, '10KTM 250XC-W
    Past BMWs: '68 R50/2, '77 R80/7, '87 R80GSPD, '76 R60/6, '85 K100RS, '91 R100GS,'87 R100RS

  5. #5
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    revised schematic to include shield between M-unit and M-Button

    schematic
    Attached Images Attached Images
    '81 R80G/S(wp4860 forks, Henderson triple clamp)
    '10 Husaberg FE450, '10KTM 250XC-W
    Past BMWs: '68 R50/2, '77 R80/7, '87 R80GSPD, '76 R60/6, '85 K100RS, '91 R100GS,'87 R100RS

  6. #6
    Day Dreaming ... happy wanderer's Avatar
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    Looking at the wiring the only concern I have is the AWG or the Positive line vs the AWG of the GND wire. It looks a bit small assuming it's a single ground point back to the control unit.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  7. #7
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    The ground to the unit is just it's ground (2amp requirement, 1.5mm^2). The Returns for all the power devices go back through the frame to the battery.

    G
    '81 R80G/S(wp4860 forks, Henderson triple clamp)
    '10 Husaberg FE450, '10KTM 250XC-W
    Past BMWs: '68 R50/2, '77 R80/7, '87 R80GSPD, '76 R60/6, '85 K100RS, '91 R100GS,'87 R100RS

  8. #8
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    I’m a bit rusty on this but it seems, IIRC, all the switching is pulled to “ground” through the “controller?
    Kinda like the horn in an older Dodge.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  9. #9
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    Quote Originally Posted by Omega Man View Post
    I’m a bit rusty on this but it seems, IIRC, all the switching is pulled to “ground” through the “controller?
    Kinda like the horn in an older Dodge.
    OM
    The M-Unit is fused on the Positive to 40A, all the switching it does is on the +ve side. For the control it uses signals to ground. I.e. to activate the horn output you tie the HORN input to ground.

    There is very low current on the ground side of the M-Unit.
    '81 R80G/S(wp4860 forks, Henderson triple clamp)
    '10 Husaberg FE450, '10KTM 250XC-W
    Past BMWs: '68 R50/2, '77 R80/7, '87 R80GSPD, '76 R60/6, '85 K100RS, '91 R100GS,'87 R100RS

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