BMW K bikes (Bricks)


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1Back to top Go down   Tail light issue. Empty Tail light issue. Mon Jul 08, 2024 6:34 am

Reg

Reg
Silver member
Silver member
Guys,

On my Recent trip out , I was told my Tail light was out.
Replaced it, Still no Joy.
Noticed front parking light also not working.
Both bulbs are Fine. 
Warning Light Didnt come on to tell me ( guess because both bulbs are fine).
Brake Light works.. 
The bike is spotless, original.  
I am Thinking the bulb monitoring unit?
Would anyone know where I could get my hands on one, even just to test..
BMW K1100RS. 1996...

The one thing that could kill a K bike.. the Tail light Sad..

Reg.

    

2Back to top Go down   Tail light issue. Empty Re: Tail light issue. Mon Jul 08, 2024 7:06 am

Dai

Dai
Life time member
Life time member
I suspect you're probably right, Reg. The BMU is the only common point for those two parts of the wiring loom, although it doesn't actually monitor the pilot light. Any BMU should do.


__________________________________________________
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 issue. Empty Tail light issue Mon Jul 08, 2024 3:07 pm

daveyson

daveyson
Life time member
Life time member
Check at fuse three.

Check if the parking lights work with the key in the park position. In this case the power to the  ignition switch is through a different circuit.

Edit: just noticed this is a K1100, maybe not very relevant, I had a K100 in mind.


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

4Back to top Go down   Tail light issue. Empty Re: Tail light issue. Tue Jul 09, 2024 2:21 pm

Reg

Reg
Silver member
Silver member
After much messing about, bypassing the bcu , I decovered just by chance , it's the ignition barrel.. Good clean out , and all is well. Hint ..don't put wd40 or any other oil down the barrel, just use electrical contact cleaner ...Pure luck I spotted it..

    

5Back to top Go down   Tail light issue. Empty Re: Tail light issue. Tue Jul 09, 2024 8:43 pm

Dai

Dai
Life time member
Life time member
Ah. You insulated the slate (grey) wire from the slate/blue wire which is the parking (sidelight) circuit. Just commenting for anyone else that happens to pass this way with a similar problem.


__________________________________________________
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
    

6Back to top Go down   Tail light issue. Empty Tail light Wed Jul 10, 2024 12:23 am

daveyson

daveyson
Life time member
Life time member
I realise now I didn't say what I was thinking, I only inferred it.

Since the front parking light was also off, therefore the problem was upstream of the BMU. So the first junction both lights have in common is the lights fuse, the next is the ignition switch. Therefore if the lights worked with the key in the park position, the fuse would be good and the ignition switch would be suspect.

But I'm looking at a 1993 K1100RS wiring diagram now, not sure if it's the same as with later models.


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

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