BMW K bikes (Bricks)


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floyd

floyd
Life time member
Life time member
Ok brains trust...im stumped.

Problem is a few weeks old. Ill describe it and list what Ive done.

PROBLEM:
* While riding, the bike will (seemingly randomly) start rapidly flashing the headlight and instrument lights
* All other functions of the bike are fine. There is no power loss - nothing at all except for flashing headlight/instrument lights
* Sometimes while this rapid flashing is happening, the indicators will also both flash
* It mostly only happens when the bike is warmed up and most often happens above 100kmh

IVE TRIED:
* replaced handlebar switches with spares
* cleaned and reseated all obvious electric connectors (ECU, tank, Ignition computer, all handlebar switch connectors, grounds, alternator, starter, battery - all good)
* replaced fuses
* checked my headlight relay wiring for issues and switched all lighting relays.
* starter motor was rebuilt with new bushes about 20,000kms ago (18 months)
* battery is fine

I havnt pulled the instruments as I also need to remove the nose fairing and im lazy, but im about to do it now. 

I also havnt changed bulbs as Im cheap.


While sitting here typing this - the tank, seat ecu are all removed - but the ignition key is turned on...the bike just sitting there with the key on...and BOTH indicators just started flashing like hazard lights.....? WTF?


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

Rick G

Rick G
admin
admin
Put a new fuse in the #7 position.


__________________________________________________
"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
    

charlie99

charlie99
VIP
VIP
just a question Floyd

where is the earth for the headlights wired from ?


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

robmack

robmack
Life time member
Life time member
Fuse holder for fuse #7 might be going intermittent.


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

floyd

floyd
Life time member
Life time member
Thanks guys.

Charlie, it's earthed at the under tank spot with everything else.

Popped an old fuse in #7 and lo and behold, on the morning commute... No flashing...


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

floyd

floyd
Life time member
Life time member
Gents....


The problem persists.....  

Ill do some fiddling around at fuse 7


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

floyd

floyd
Life time member
Life time member
After an uneventful, flash free morning ride - post #7 fuse swap - I was confident the problem was gone.

On the arvo ride home, indicators were going mental.

This mornings ride, the flashing was at its worst ever. I had to even reach around and pull the headlight plug. It was strobing like a Spanish nightclub.

This arvo, the beast hemorrhaged wires everywhere.
Flashing Headlight (and sometimes blinkers)... P1000915


And there is nothing apparently wrong at fuse #7....      scratch


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

Rick G

Rick G
admin
admin
Change the bulb monitoring unit because that is what makes the problem happen when there is no power on fuse #7.


__________________________________________________
"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
    

floyd

floyd
Life time member
Life time member
RicK G wrote:Change the bulb monitoring unit because that is what makes the problem happen when there is no power on fuse #7.

Cheers Rick.

Done.

Fingers crossed.


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

Dai

Dai
Life time member
Life time member
RicK G wrote:Change the bulb monitoring unit because that is what makes the problem happen when there is no power on fuse #7.
Rick - I'm missing something here. Why would fuse 7 blowing affect the BMU?


__________________________________________________
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
    

Rick G

Rick G
admin
admin
Dai wrote:
RicK G wrote:Change the bulb monitoring unit because that is what makes the problem happen when there is no power on fuse #7.
Rick - I'm missing something here. Why would fuse 7 blowing affect the BMU?
It doesn't I am apparently loosing it and I can't even remember what "it" is.
Floyd forgive me the flasher unit.
I'm not well ATM got some lurgi or I took a bait.


__________________________________________________
"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
    

floyd

floyd
Life time member
Life time member
Far out...Im sick of taking my fuel tank off

Ive changed just about every relay many many times and now have it to a stage where the headlight and instrument lights no longer seem to flash.

The indicators seem to mostly work. they dont come on randomly, but occasionally when i hit one of the flasher buttons it will not flash. If i then hit the cancel button, and the flasher button again it will now flash....

Weird...

Have switched flasher relay, BMU, LSR...

Oh, and I cleaned the starter this morning. The brushes are like new and its now spotless


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

charlie99

charlie99
VIP
VIP
corrosion across one of the switches of the flashers switches ? causing a near earth situation ?

try and measure the earth to the headlight and directly to the battery on the other meter lead to see if you have a significant voltage drop ..meter on dc volts

see if you can get it to flash and notice the voltages if there is some there  ...an analogue meter might be best to see the change if there is one .

just a  thought


or do I get on gerty with my tools tomorrow ?


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Bikesmith

Bikesmith
Silver member
Silver member
Could this be an ignition switch issue? I was just yesterday getting all kinds of screwy symptoms on my bike (including very dim dashboard lights) that all went away when I rebuilt my ignition switch.


__________________________________________________
Jon
Mechanically competent, electrically perplexed
------------------------------------
1985 BMW K100RS
1959 BMW R60
1942 Chevrolet 3/4-ton Special
1940 Royal Enfield WD/CO
1975 Porsche 911S
    

floyd

floyd
Life time member
Life time member
So sorry I missed you Charlie. I was home in the shed all day too - just a different home....Bummer

I now think (with no evidence) that my original problem has been solved. Pretty sure it was the load shed relay, but could be wrong.

I now also think that my intermittent blinker (it occasionally will not stay on, but when I hit the cancel button first, then an indicator - it will work fine) problem is with a handlebar switch ive changed to, to eliminate that from causing my previous issue....

Will investigatre...but Im now very happy im not a strobing nightclub on my commute.


__________________________________________________
K100 with lots of K1100 bits - mongrel of a thing...
    

6strings

6strings
Silver member
Silver member
Whenever that happens on my bike I take out the starter and clean the armature and brushes with contact cleaner and sometimes jewelers paste on the armature, no sand paper or steel wool, that will cause brushes to wear out faster, that experience talking. That alway cures the flashing headlight and weird turn signal problems. Even when I put a new starter in it, at great expense, because I didn't know about eBay at the time, It still would do that flashy thing after about 3,000 miles or so.

    

Beamer

Beamer
Platinum member
Platinum member
Yes, I also think this problem can be related to starter motor, though I don't understand how that can happen.

I recently had a breakdown which turned out to be due to  end-of-life of one of the carbon brushes. Before I diagnosed the problem, I managed to get started and rode home with a madly strobing headlight. Both main and dip so not a dubious bulb.

I fixed the starter by swapping with another bike which has a good one and the headlight seems stable since.

None of that makes sense to me but since others have reported some linkage, I thought I'd throw it in.

    

18Back to top Go down   Flashing Headlight (and sometimes blinkers)... Empty Re starter motor Sat Jun 18 2016, 19:01

Garyk100

Garyk100
Gold member
Gold member
I had a similar problem a few years ago, the bike started as normal but left hand indicator stayed on even after the key was removed, did not flash but stayed on, after swapping flasher boxes and checking all connections found the brushes in the starter motor were worn out, replaced the brushes all fixed.


__________________________________________________
The early bird catches the worm, but the second mouse gets the cheese

1991 K100rs16v
    

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