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Mechanical and Technical Mechanical and technical topics, help, and discussions

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  • 1 Post By Scribbles
  • 1 Post By Sentinel
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Sep 7th 2017, 01:59 PM   #1
 CodeBlue's Avatar
 
  Jan 2016
  Seattle, WA

  KTM 990 Adventure
Front brake lever not activating brake light

My 2008 KTM 990 Adventure is giving me trouble. The rear brake lever activates the brake light, but the front brake doesn't. The fuse is intact, and the light definitely works. I just don't know where to start in diagnosing the problem. This is my only vehicle, and my front braking/compression braking muscle memory doesn't like being interrupted to introduce the rear brake.

Does anyone have an idea?
Sep 7th 2017, 02:11 PM   #2
 Scribbles's Avatar
 
  Jan 2016
  NW

Either a bad switch, bad connection or possibly an out of adjustment switch.
I'd guess it's a bad switch,


If you follow the wiring back from the switch, there should be a connector somewhere that you can disconnect and then check with a voltmeter;
Does closing the circuit activate the light?
Does the circuit open and close by the switch?

not familiar with that bike, but see if there is an adjustment screw that will activate the switch sooner.

this might help you find a cheap replacement,
KTM 990 Brake Light switches? | Adventure Rider
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Sep 7th 2017, 04:50 PM   #3
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2015 Kawasaki Concours 14 - The Origame Sea-Dragon
odds are - the connector is loose on the perch connection.

also, you can short the two leads on the two-wire cable connector that goes to that front brake switch connector and see if the wires are ok. if you use something like a paper-clip to short the leads together the light should come on when the two leads are touching and go off when they are not.

if the connector is installed properly on the perch connection, and if the brake light comes on when you short the leads, your switch is bad.

i am pretty certain open=off and short=on.
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Sep 7th 2017, 06:24 PM   #4
 CodeBlue's Avatar
 
  Jan 2016
  Seattle, WA

  KTM 990 Adventure
It turns out the switch was bad. I pulled it apart, hit the connectors with some sandpaper and contact cleaner, then realized that the problem was a failed spring. That's beyond my skill level, so I just ordered one from I90.

Thanks everyone for the help. You're awesome!
Sep 8th 2017, 03:22 PM   #5
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2015 Kawasaki Concours 14 - The Origame Sea-Dragon
there's something inside this that may help.

i have like 100 of these in my kitchen junk drawer. took me 25 years to collect them all.

that, and a crescent wrench or two that say "WQ01" (bonus points if you know what that is.)

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activating, brake, front, lever, light



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