BMW K bikes (Bricks)


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half brick

half brick
Silver member
Silver member
Earth cables - where should I have them? K100 LT '89

None were fitted when I got it as a stripped down project.

The only earth cable on my bike goes from the battery to the frame earth under the tank where the loom earths.

Should there be a cable from battery to engine? Gearbox? Should the ECU casing be earthed?

Currently have an issue with the cooling fan and temp warning light coming on when bike is cold.

Thanks


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K100 LT 1989
    

Tom G

Tom G
Life time member
Life time member
On my 93 75, I did the following modification as far as earth cables go:- I disconnected the under tank earth wire cluster- about 5 wires. Then bolted a bar with 6 threaded holes onto the frame where the 5 earth wires were connected. Then ran a cable from the bar to the neg.side if battery and connected the 5 earth wires to the bar. Also ran another cable from battery to one of the retaining bolts for the starter motor. Also made sure earth cable connection on transmission is clean and tight. Sorry for long winded reply but this has solved some earth/ground problems. Cheers Tom


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1986 K100RT Ex Police (Slightly modified)
2010 Suzuku DL650 V Strom
1992 R100R
    

Holister

Holister
Life time member
Life time member
+1 that...Earth cables - where should I have them? K100 LT '89 112350


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 Earth cables - where should I have them? K100 LT '89 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

half brick

half brick
Silver member
Silver member
Thanks, I've now fitted an earth to gearbox, and will do one to starter. Already got one to under tank point.


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K100 LT 1989
    

AL-58

AL-58
Life time member
Life time member
You'll sometimes see a small lead running from one of the master cylinder cap screws down to the frame. My TT didn't and earthed through the throttle cable ruining the throttle cable at the same time.


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'93 K1100LT
'08 F650GS (798cc)
'19 R1250RS

+ another boxer engined motorcycle and sidecar

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

Earth cables - where should I have them? K100 LT '89 K-dogs10
    

Rick G

Rick G
admin
admin
The ECU casing does not need to be earthed and I believe it should not be earthed.


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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 1999 K1100 LT with a Big Block 1200
    

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