BMW K bikes (Bricks)


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1Back to top Go down   tail light not coming on Empty tail light not coming on Mon Jun 24, 2024 4:49 pm

mmgee123

mmgee123
active member
active member
hey everyone i have a 1988 k100 and i’m converting to a scrambler. i’m trying to wire a custom led tail light to mount on the frame, and i’ve wired up the ground wire and running light and it’s not coming on, i’ve checked all the fuses on the side (the 7 that are closest to the air box) and they’re all fine. i previously wired up the same tail light and fried it accidentally so i purchased a second one and now it isn’t wanting to work with me. any help?

    

2Back to top Go down   tail light not coming on Empty Re: tail light not coming on Mon Jun 24, 2024 5:17 pm

Dai

Dai
Life time member
Life time member
Take it off the bike and test it on a battery. That will give you a go/no-go for the next stage.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   tail light not coming on Empty Re: tail light not coming on Tue Jun 25, 2024 9:50 pm

robmack

robmack
Life time member
Life time member
The BMU controls power to the rear marker light.  Is your BMU remaining lit all the time even though you've engaged the front and back brake levers at least once since turning on the ignition?  If so, you might need to mod the BMU.  See Duck's instructions here: http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/bmu/bmu.htm

http://k75retro.blogspot.ca/
    

4Back to top Go down   tail light not coming on Empty Re: tail light not coming on Tue Jun 25, 2024 11:07 pm

duck

duck
Life time member
Life time member
If you're making a scrambler and using LEDs you can just ditch the BMU and wire as follows:

Gray/White wire from BMU connector to 12V+ of tail LED.

Gray/Green (front brake switch) and Grey/Red (rear brake switch) from BMU connector to 12V+ of brake light.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
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14 Yamaha WR250R
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