BMW K bikes (Bricks)

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1Back to top Go down   Minor head-scratcher with the BMU Empty Minor head-scratcher with the BMU on Sun Apr 17, 2016 5:47 am

Dai

Dai
Life time member
Life time member
LFB has taken to blowing no.2 fuse (the pilot/tail light circuit). I'm not worried about that because I'll find the source of the problem sooner or later. What has me mildly puzzled is that when the fuse blows and the tail light goes out, the BMU doesn't react. The red warning light doesn't come on. I tried another BMU with the same result. Conclusion: my understanding of how the BMU works is incorrect. Can anyone enlighten me as to its actual functionality please?


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'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

2Back to top Go down   Minor head-scratcher with the BMU Empty Re: Minor head-scratcher with the BMU on Sun Apr 17, 2016 6:21 am

Inge K.

Inge K.
VIP
VIP
If the fuse blows the BMU react the same way as you haven't switched on the light.......
no voltage input, all is OK.

If the bulb blows you still have voltage input at the BMU, but no current flow...
warning light shows.


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

3Back to top Go down   Minor head-scratcher with the BMU Empty Re: Minor head-scratcher with the BMU on Sun Apr 17, 2016 9:58 am

Dai

Dai
Life time member
Life time member
Thanks Inge.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

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