I know its an electrical problem but im not sure where to start. Every time i press brakes/horn its as if they were a killswitch. When i pull the fuse for the brakelights the bike runs perfectly as if nothing is wrong. Fuse in, bike dies. Any opinion would be appreciated.

 

Hi ,it sounds like a problem with the horn switch itself , test the switch , the Light Green wire and the Bl/Br wire on the switch side, probably could do with a clean up inside the switch itself, if you use WD40 make sure its the WD40 Electrical or Dielectric grease, also the Lg wire through to the horn to make sure its not "chaffing" any where to earth

 

You already have a thread about this.

https://cbrforum.com/forum/cbr-929rr-20/electrical-issue-help-156165/