BMW K bikes (Bricks)

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1Back to top Go down   Mystery wire Empty Mystery wire Sun Jan 23, 2022 4:20 pm

Listerenthusiast

Listerenthusiast
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Last autumn I took off the old battery on my 1990 K100RS with the intention of replacing it .   Got a new battery a short while ago , put it on then found I had a blue wire with a battery terminal one end and spade connector the other , its  about twelve inches long so this restricts where it goes to ( possibly alternator ?) but can I find where the spade connector goes , NO .     Sorry for this pathetically simple question but it has me stumped.   Any thoughts please ?

    

2Back to top Go down   Mystery wire Empty Re: Mystery wire Sun Jan 23, 2022 4:38 pm

Point-Seven-five

Point-Seven-five
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Is there a blue wire connected to the alternator?  Pretty sure that's where it should go.  I just don't understand why it goes directly to the battery positive terminal.



Last edited by Point-Seven-five on Sun Jan 23, 2022 4:41 pm; edited 1 time in total


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

3Back to top Go down   Mystery wire Empty Re: Mystery wire Sun Jan 23, 2022 4:39 pm

Arlina

Arlina
Moderator
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Guess it must be original brown, earth.
1 end goes to - , the other on the housing of the computer.


__________________________________________________
Mystery wire Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

4Back to top Go down   Mystery wire Empty Re: Mystery wire Sun Jan 23, 2022 4:54 pm

robmack

robmack
Life time member
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Post a picture of the wire to make sure its OEM and not aftermarket.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

5Back to top Go down   Mystery wire Empty Mystery wire Mon Jan 24, 2022 5:31 am

Listerenthusiast

Listerenthusiast
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New member
Thank you for these thoughts , I will have another look today and see if I can come up with the answer Big thumb .   I do have a picture of the wire but as I am a bit of a "Dinosaur"  , not sure how to post it

    

6Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 8:53 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Is there a blue wire connected to the alternator?  If not, that may answer your question.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

7Back to top Go down   Mystery wire Empty Success Mon Jan 24, 2022 11:39 am

Listerenthusiast

Listerenthusiast
New member
New member
Thank you all for your help here and it DOES go to the alternator .    Got the bike outside in much better light and after removing everything including the battery , found the "spade" connector on the end of the Alternator . Mystery wire 212902 I have a terrible thing to admit though !!!!!  The offending wire was Black not Blue as I stated . Sorry  Mystery wire 652573

    

8Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 11:51 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The problem now is that the wire in question doesn't go to the battery.  In the wiring drawing, it looks like it goes to the instrument cluster.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
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
    

9Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 2:55 pm

Dai

Dai
Life time member
Life time member
Should have enough posts to upload a piccy now. Problem as I see it is that it can't be an OEM wire because BMW only used black to connect up the water temp sensor under the oil/water pump at the front. It's a blue wire from the alternator to the instrument cluster.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

10Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 4:30 pm

Arlina

Arlina
Moderator
Moderator
Cut the green wire they said...
It will be fun they said....

Mystery wire ?appId=21791a8992982cd8da851550a453bd7f&quality=0


__________________________________________________
Mystery wire Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

11Back to top Go down   Mystery wire Empty Mystery wire Mon Jan 24, 2022 4:30 pm

daveyson

daveyson
Life time member
Life time member
There could be a black earth wire from the battery to gear box, above the shift lever.



Last edited by daveyson on Mon Jan 24, 2022 4:34 pm; edited 1 time in total


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

12Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 4:34 pm

Arlina

Arlina
Moderator
Moderator
Just for the record; the K100RS is a 8V or 16V ?


__________________________________________________
Mystery wire Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

13Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 4:40 pm

Arlina

Arlina
Moderator
Moderator
Mystery wire 20220110
Mystery wire 20220111


__________________________________________________
Mystery wire Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

14Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 5:15 pm

Dai

Dai
Life time member
Life time member
That's a brown wire hiding in a black coat! Very Happy


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

15Back to top Go down   Mystery wire Empty Re: Mystery wire Mon Jan 24, 2022 5:53 pm

Arlina

Arlina
Moderator
Moderator
Dai wrote:That's a brown wire hiding in a black coat! Very Happy
That cheecky bastard ! Razz


__________________________________________________
Mystery wire Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

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