BMW K bikes (Bricks)

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lonerjits

lonerjits
New member
New member
My son and I bought a 1985 K100.  It does not have the front fairing, and therefore no front turn signals.  The rear turn signals are solid when we turn them on, and we are trying to put on LED turn signals on the front, just to get it legal so we can register it.    LED's on front turn signals are not turning on when turn signals are turned on.  

I am new to working on motorcycles, so may not know all of the terminology or how to properly explain problems and issues, so sorry in advance.

    

Michael Sydney

Michael Sydney
Silver member
Silver member
Sounds like a good parent/child project.

Not sure what "solid" means in regards your rear turn signals. I take it to mean working ok ( but probably flashing too fast).

LED lamps are tricky in that they will not work if wired in reverse... Positive and negative must be correct, but no damage done if connected wrong. Try reversing the two LED connections.. If still not lighting check supply with volt meter ( or check LED connected direct to 12 volt battery).

Maybe when you do get the fronts working they will still flash too fast to be legal. If so there is a fix for that . 

Good luck.


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Living in the past! K100 '83 and R65 '83.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
First, verify if the previous owner removed the turn signal relay located inside the fuse box/wiring box under the back of the petrol tank. Listen for clicks or humming when the indicator switches are pressed (61 31 1 459 224 is the relay's part number). Once you know you have it search the forum for turn signal operation because using LEDs will cause a rapid flash due to a lack of the correct resistance, and you will find how to minimise the flash rate somewhat by a subtle modification to the internals. Look for a post by Duck explaining the technique.



Last edited by Two Wheels Better on Mon Oct 01, 2018 9:22 pm; edited 1 time in total


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1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-P  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

Dai

Dai
Life time member
Life time member
If you open the box up as TWB suggests, the turn signal relay is the big black one. The green one that is the same size is the Bulb Monitoring Unit (BMU).


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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
    

duck

duck
Life time member
Life time member
@Dai wrote:If you open the box up as TWB suggests, the turn signal relay is the big black one. The green one that is the same size is the Bulb Monitoring Unit (BMU).

The flasher relay has a green case on early bikes, black on later bikes.

Turn Signals, Solid, Trying to Wire Front LED's 1greenrelay

Turn Signals, Solid, Trying to Wire Front LED's 2blackrelay


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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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

Ron Ashurst

Ron Ashurst
Silver member
Silver member
Loner, are the rears blinking at all or do they stay on all the time?
American slang has caused a little confusion I think.


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1988 BMW K100LT ....minus the fairing.
    

Dai

Dai
Life time member
Life time member
Aw, that'll teach me to post just after I get in from work at 1.00am!!!


__________________________________________________
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
    

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