BMW K bikes (Bricks)

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roach374

roach374
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I'm redoing the wiring on my cafe build, and from looking at the K75 wiring diagram, I can't tell how the clutch and gear switches are connected to the Starter (or the ICU). All I see is a connection to the indicator lights. Can someone help me trace out the wiring to figure out how the gear and clutch switches prevent the bike from starting?


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1993 K75 standard
    

Suzi Q

Suzi Q
Life time member
Life time member
A useful tip with the K wiring:

Brown is ground: brown with a candy stripe indicates a switched ground i.e. somewhere it will get switched to ground to function.
Green is 12v: likewise, green with a candy stripe is a switched 12v.

The starter pushbutton is fed with a switched 12v (black with green stripe) from two sources: 

Source 1: the clutch switch, which itself is fed with a switched 12v (green with black stripe - confusing huh?) which comes from the ignition switch via fuse 1. This 'alternative' supply ensures that you can start the bike in gear, but only if the clutch lever is pulled in.
Source 2: the gear position sender. This (also black with green stripe, 'cos it's always at the same potential as the wire from the clutch switch - they join up at the starter switch) comes from the power to the neutral light, which is supplied to it from the gear position indicator circuit. IMPORTANT: there's a diode after the indicator light, which prevents the neutral light illuminating just 'cos you've pulled the clutch lever in. That wouldn't be good, you'd fall off.

Edit: If you have the mental discipline, it's perfectly possible to wire things much more simply: feeding the starter button (black with green stripe) from the clutch switch only - so's you pull the clutch lever in to start. Or, (for heroes only) feed the starter button direct with the green-with-black wire  Shocked. I've done it and, yes, there have been occasions.....


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Sometimes I'm not really Suzi Quatro.
    

roach374

roach374
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EXACTLY the answer I needed, Chris. Thanks!


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1993 K75 standard
    

92KK 84WW Olaf

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One place I posted that 16v Ks have sidestand switches, 2v engine Ks do not.

Not here, but someone corrected me to say the K75S does also have one.

Can someone confirm if this is in fact correct.?


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

5Back to top Go down   [1993 K75] Trouble reading wiring diagram: How do the clutch and gear switches stop the bike from starting? Empty Wiring Fri Feb 26, 2021 11:16 pm

daveyson

daveyson
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Hi Olaf,

I have a '91 k75s, it has the same cable operated side stand arrangement as with my k100's. I couldn't see any wiring to it.


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11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

92KK 84WW Olaf

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Life time member
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That's my thought too, I did not believe it had the side stand electrical cut out and it got heated at the time. I have that clutch operated side stand on my 92 K100LT.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

RicK G

RicK G
admin
admin
AFAIK there has never been a K75 with that side stand switch. The L-Jetronic system is not set up for it and the Motronic system is set up and disables the injectors.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

madhatter

madhatter
active member
active member
my 93 k75s , which was the last year they were manufactured i do believe , does not have a side stand safety switch

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
My '94 K75S had the clutch retracting interlock on the side stand.


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Laitch

Laitch
Life time member
Life time member
It's time to breakout the glyphosate and scythes.Smile


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1995 K75 81,000 miles
[1993 K75] Trouble reading wiring diagram: How do the clutch and gear switches stop the bike from starting? Usa-lo10
    

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