Author Topic: Warning light flickering, but brakes and bulbs are OK?  (Read 6552 times)

Offline NSvane

  • Motobrick Curious
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Warning light flickering, but brakes and bulbs are OK?
« on: May 23, 2016, 01:37:54 PM »
Hi everybody

My dear old brick (K75 '87 no abs) has developed an irritating feature during my last runs.
The warning light in the dash (the one with the triangle), has begun flickering at speed - usually around 110 km/h, but also at other speeds.

Ive checked that the bulbs are not blown, at that the wires are fine. So what would you guys suggest should be the culprit of this behaviour?

In my knowledge the warning light only lights up at start-up, until both brakes has been used. It also lights up at speeds over 160 km/h Ive noticed ;)

  • Denmark
  • K75C '87, Renault R4 850cc '83

Offline Laitch

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #1 on: May 23, 2016, 02:07:02 PM »
Ive checked that the bulbs are not blown, at that the wires are fine. So what would you guys suggest should be the culprit of this behaviour?
Fault in the bulbs, fault in the sockets, pinched wire, fault in the wire connections, instrument plug needing cleaning, developing faults in brake lever switches. I'd go over everything carefully, again. Check the rear brake switch wiring connections. A couple of these bulb monitor dramas originated with pinched wiring in that area.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline alexis291

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #2 on: May 25, 2016, 01:51:16 PM »
When I had this it was the front brake light switch.


K1100RS 1995
  • UK
  • K1100RS 1995

Offline johnny

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #3 on: May 25, 2016, 02:46:56 PM »
me too... front brake switch... id be rolling with audiovox cruz set 50 or 60 mph over... then bam... bmu would flucker and id nose down... quite a handful when rolling no handed...

it was the front brake micro switch up on the perch...

whack...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline alexis291

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #4 on: May 26, 2016, 02:29:07 AM »
If you find my thread on 'ABS lights' there is a part number for a cheap switch from eBay.


K1100RS 1995
  • UK
  • K1100RS 1995

Offline NSvane

  • Motobrick Curious
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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #5 on: May 26, 2016, 06:40:34 AM »
Johnny was that the abs that blocked the wheel?

My bike is a non-abs model, so I'm thinking that theres no danger in driving with the flickering light.

I'll try cleaning the contacts, and checking the bulbs again, as the weather here in Denmark has been quite wet the last few weeks, and might have affected the system.
  • Denmark
  • K75C '87, Renault R4 850cc '83

Offline johnny

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #6 on: May 26, 2016, 07:21:28 AM »
not following you... i didnt say anything about abs or wheel... figger that must be code words for hashish butter...


  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Laitch

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #7 on: May 26, 2016, 07:28:36 AM »

My bike is a non-abs model, so I'm thinking that theres no danger in driving with the flickering light.
The light is a bulb monitor. In your bike's case the light's function is to tell you that the brake and/or tail light is not functioning. If it is flickering, rear bulbs may be flickering as well. Check the rear light wiring for wear and pinching along its path too. Maybe you can find somebody to watch the rear lights when the bulb monitoring light is flickering. There may be a fault in the bulb monitor itself, but check your tail light and brake light system completely first.
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline NSvane

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #8 on: May 26, 2016, 07:47:20 AM »
I just read the nose-down remark as something to do with blocking the wheel, hence it being a handful :)

I'll check the whole system when it stops raining again.
  • Denmark
  • K75C '87, Renault R4 850cc '83

Offline bocutter Ed

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #9 on: May 26, 2016, 09:08:55 AM »
audiovox cruz set 50 or 60 mph over

I just read the nose-down remark as something to do with blocking the wheel, hence it being a handful :)

cruise control ... faulty brake switch would set it free ... engine braking ... at 50 or 60 mph over limit ... no hands (maybe takin' pics of donks) ...   :yow  ... whack ...
  • Toronto, Canada
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Offline johnny

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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #10 on: May 26, 2016, 09:16:10 AM »
thats right cutter...

goes from :riding: and  :foto: to  :yow like bam...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline NSvane

  • Motobrick Curious
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Re: Warning light flickering, but brakes and bulbs are OK?
« Reply #11 on: May 26, 2016, 01:39:04 PM »
Learning something new about the lords great english everyday ;) And apparently also about the functionality of a speedholder.

See what owning a brick might lead to !
  • Denmark
  • K75C '87, Renault R4 850cc '83

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