BMW K bikes (Bricks)

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1Back to top Go down    85 rs has no rear running light.. on Sun Nov 19, 2017 4:51 pm

webster

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rear parking light and head lights are going on. Just the rear running light out. Fuse seems solid. No indication from the bmu. Idea

    

2Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 5:18 pm

Laitch

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My bike has two bulbs under the rear red lens. One we up here in the wilds of Vermont call a taillight and the other is called a brake light. Are either of those what you are discussing? Have you looked at the bulb to see if its filament is damaged, its socket contacts corroded or its socket connectors have loosened?


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1995 K75T 68,000 miles
    

3Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 5:22 pm

Inge K.

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Does the front park lamp function? ...if not check fuse #2.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

4Back to top Go down    Yes.. on Sun Nov 19, 2017 6:53 pm

webster

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front parking light works. Rear parking light works; back taillight{running light} does not.

    

5Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 7:16 pm

92KK 84WW Olaf

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Take off the rear light and have a look at the connector block behind it. I had issues with that on the RT caused a similar problem. The bulb holder can also cause trouble.


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1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 67,300 miles
    

6Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 7:58 pm

webster

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It is odd in that the running light is the same as the parking light bulb; which works. Fuse is good.

    

7Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 8:10 pm

RicK G

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Check the fuse with a meter they often go open circuit without actually blowing. Corrosion inside the plastic part is the problem, it's a good idea to replace all the fuses with bikes this old.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

8Back to top Go down    Re: 85 rs has no rear running light.. on Sun Nov 19, 2017 8:18 pm

92KK 84WW Olaf

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Rear bulb for running light and the brake light go to the same wiring block behind the rear number plate. Either power or earth is an issue there? I have had same problem and that's where mine was. Check the connectors very carefully.


__________________________________________________
1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 67,300 miles
    

9Back to top Go down    Re: 85 rs has no rear running light.. on Mon Nov 20, 2017 2:55 am

Inge K.

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@webster wrote:front parking light works. Rear parking light works; back taillight{running light} does not.

If the front parking light goes out when you turn the headlamp on....you need
to dismantle and clean the ignition switch.
Plenty of links for this inside this forum.....use the search function at the portal.

Before dismantling check if you have power at the grey/blue wire in the ignition
switch connector when the headlight is turned on...if no power, the problem is
elsewhere in the wiring system.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

10Back to top Go down    I was looking at that unit.. on Mon Nov 20, 2017 9:28 am

webster

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will start the process to clean it. Many thanks. Turns out there is no power to blue grey wire with headlight on. Did disassemble and clean switch. Switched relays for starting circuit{ drops voltage to lights during start up}. Still no parking light with head light...

    

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