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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: rmut on March 26, 2017, 01:13:15 PM

Title: Horn won't turn off!
Post by: rmut on March 26, 2017, 01:13:15 PM

Morning all.


I've just finish resurrecting a '92 K75 that had sat for 10 yrs, and all was well until...


Five miles from home, I turn the key full on and placed the started switch in the on position. As soon as I did, the horn started to sound and would shut off unless I turned the key back to the off position.


I know, amusing...


I decided to go for it and as I was riding home, the only thing that would reduce the horns sound was to rev the engine up to the 5-6k rpm's.


I'd rather not spring for a new relay and switch without knowing the issue.


Is this anything anyone has come accross?


Much thanks! 

Title: Re: Horn won't turn off!
Post by: rmut on March 26, 2017, 05:29:06 PM

j o,

The relay switch-out is where we'll start.

BTW- Very grateful to you and everyone here for the incredible resource you've built for those of us climbing on K's for the first time.

Salut!

Title: Re: Horn won't turn off!
Post by: Al on April 03, 2017, 09:36:37 AM

Sorry to reply to an older thread but I had the same problem. Very annoying. If mine got rained on while stationary the horn would go off on its own. Not so bad on the highway but humiliating in town. The kill switch would do likewise.


I think water gets in between the contacts and allows it to go full toodle.  I took it apart and sprayed some contact cleaner and swabbed them with a Q Tip. Then I put some dielectric grease on the contacts to exclude water. Just a small dab'll do ya.  That seems to have solved it. I went through all the switches as far as I could and cleaned them up.


In going through the switches it seems that the contacts on some have receded into the plastic surrounding them. My headlight high/low beam seems to be intermittent as well. I was thinking to tin a piece of 1/8" by .020" phosphor bronze strip and solder a square of it onto those contacts to build them up a bit.


My kill switch has cut out on occasion leaving me nervous. There is thread in the library here on that fix.


There is a thread in the MOA website tech library showing how to disassemble the switches.


All the best on your gremlin slaying.

Title: Re: Horn won't turn off!
Post by: rmut on April 03, 2017, 09:52:36 AM

Al,


Very helpful and with Spring sun drying things out, I will now take the opportunity to get inside, look at the leads and see where we are.  Much appreciated!


Perhaps not fixing your kill switch provides just the reason to never stop...


Enjoy and thanks!

Title: Re: Horn won't turn off!
Post by: Laitch on April 03, 2017, 10:19:55 AM

Unplugging it would work on my bike as a temporary dignity restorer.

Title: Re: Horn won't turn off!
Post by: Al on April 03, 2017, 05:04:06 PM

Unplugging is tough on a full fairing bike. But its worth trying I suppose.