First of all, hello to everyone on forum
I am member for a long time on two car forums and know how useful they can be.

What is problem a have..
Horn, turn lights everything else work fine until few days ago.

My ignition switch has come with broke lock function and i took off and replase that part. All wires and conectors back like was.. ( I suppose )
That days doesn't check horn and indicators..

Few days ago was a nice day and took out for a ride..notice that not have left front/back indicator and horn..

Check fuses and one od 10A for turn signal, horn...was gone.
Put another, horn not working and left indicators.. When turn switch for indicator it's bloves.

Found some wiring diagram for 2003 600RR and that fuse is for: brake light, horn and indicator relay

How maybe horn not work becayse is conect with side stand switch..( see now on diagram) Will check that again..

But when i measure on fuse box....There is negative (ground) instead positive on fuses !!!

 

Do you mean the old fuse was blown (melted or broken) or was it missing entirely? If so, it sounds like a short circuit

The fuse blows when the turn signal is used, correct? If it blows when the turn signal is used, that's where the problem is. Using the circuit diagram it should be possible to rule out the sidestand switch and narrow your search

I would recommend starting by checking your ignition switch. It's a good rule of thumb that when a sudden electrical problem occurs immediately after replacing a part, that should be the first place you look. It could be as simple as a positive wire connected where a negative wire should go. That could be why it shorts

I'd also recommend a thorough visual inspection of the plug and wires leading to the handlebar. Unplug connections and verify that they are not burned/melted or excessively rusty

Good luck

 

Jon, problem solved
Thanks a lot

First about horn.. She die and because that she not beep
And about fuse box....my multimetar was wrong set and show ground on fuses..

Fuse for turn signal blows when it used because short circuit in wiring for rear left indicator.
Extra bulb is hide in wiring because LED indicators...and she is quilty.. there was short circuit.