BMW K bikes (Bricks)

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1Back to top Go down    Wiring in a new Speedometer on Tue Nov 07, 2017 3:42 pm

DBRMN

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To start I have a 1991 BMW K100LT ABS

I have purchased the MotoGadget motoscope mini (which comes with its own speed sensor which I don't want to use) which has five wires coming out of it:

Red - Power Supply
Black - Power Supply (Ground)
Yellow - Signal cable of the rev. counter (Leads to the negative pole (clamp 1 or -) at one ignition coil)
White - Connection of the motoscope to the speed sensor (Leads to the signal cable of the OEM speed sensor, or delivered sensor that witched to earth)
Green - cable for the menu push button

Manual:
https://motogadget.com/shop/media/downloads/manual/msm_manual_en_2.3_k.pdf


Now so far I have identified were the Green and Black wire goeslol!and thats it.

I have also identified every wire that comes out of the original instrument cluster:


So my questions are, Where is the original instrument cluster getting its main source of power from? Which wire?, Which of the three Tacho related wires is the one i need? (21-23) and If I don't want to use the Speed sensor that goes with the motoscope which wire is the original speed sensor for the original bike?

Thanks,

DBRMN

    

2Back to top Go down    Re: Wiring in a new Speedometer on Tue Nov 07, 2017 9:18 pm

robmack

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@DBRMN wrote:So my questions are, Where is the original instrument cluster getting its main source of power from?

Which wire?
Pin 6 for switched 12 Volts, Pin 1 for unswitched 12 Volts, Pins 13 and 18 are ground returns.

@DBRMN wrote:Which of the three Tacho related wires is the one i need? (21-23)
Tachometer input is Pin 16, not any of Pin 21-23.

@DBRMN wrote:and If I don't want to use the Speed sensor that goes with the motoscope which wire is the original speed sensor for the original bike?
You can't use the builtin speed sensor on the Motoscope as it stands; It is incompatible. You'll need either a TGPI v5 board of mine or a Brotbox v3 from Maru Labs to get the job done.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

3Back to top Go down    Re: Wiring in a new Speedometer on Wed Nov 08, 2017 3:53 am

DBRMN

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@robmack wrote:
@DBRMN wrote:So my questions are, Where is the original instrument cluster getting its main source of power from?

Which wire?
Pin 6 for switched 12 Volts, Pin 1 for unswitched 12 Volts, Pins 13 and 18 are ground returns.

@DBRMN wrote:Which of the three Tacho related wires is the one i need? (21-23)
Tachometer input is Pin 16, not any of Pin 21-23.

@DBRMN wrote:and If I don't want to use the Speed sensor that goes with the motoscope which wire is the original speed sensor for the original bike?
You can't use the builtin speed sensor on the Motoscope as it stands; It is incompatible. You'll need either a TGPI v5 board of mine or a Brotbox v3 from Maru Labs to get the job done.

Thank you so much for your reply! this is so helpful.

    

4Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 6:11 am

DBRMN

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Not sure if anyone will reply to this thread but here I go anyway lol. So I'm looking at the pins for the instrument cluster plug and trying to work out which ones I no longer need. But there is one pin that I don't know the function:

Pin 14: Lamp Monitoring

    

5Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 6:24 am

robmack

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Its the output from the Bulb Monitoring Unit. Goes to an indicator lamp that lights when the tail light bulb is burnt out. On the ABS models, its also the ABS status light.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

6Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 6:26 am

DBRMN

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@robmack wrote:Its the output from the Bulb Monitoring Unit. Goes to an indicator lamp that lights when the tail light bulb is burnt out. Optional.
Wheres that on the instrument cluster though?

    

7Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 6:28 am

charlie99

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the red warning triangle


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

8Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 6:35 am

DBRMN

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@charlie99 wrote:the red warning triangle
I thought that was Hazards lol

    

9Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 12:32 pm

robmack

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BMW use the same symbol on the hazard switch (industry standard), however all four signal lights and both pair of signal indicators on the dash blick when activated.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

10Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 1:05 pm

Inge K.

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The standard symbol used on hazard switches (also ours) is a double triangle.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

11Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 2:57 pm

DBRMN

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@robmack wrote:BMW use the same symbol on the hazard switch (industry standard), however all four signal lights and both pair of signal indicators on the dash blick when activated.
That was going to be my next question lol I guess I've never tested it out.

    

12Back to top Go down    Re: Wiring in a new Speedometer on Sun Nov 12, 2017 2:57 pm

DBRMN

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@Inge K. wrote:The standard symbol used on hazard switches (also ours) is a double triangle.
Oh that makes more sense

    

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