Any ideas on what the issue could be?

[hardy79]

When I throttle my 150 Super and the horn goes sounds constantly...only a low tone but it wont stop anyone had this issue? Any help greatly appreciated

Cheers

[scooterg]

How many wires on horn ?
If two swap them
Has the horn button jammed in,
Remove horn button and check if wires are touching,jammed on,on the inside

[ianmartin40]

A good starting point has to be headset top off and check wires for broken or damaged insulation, and check switch at the same time.

[mijapxman]

Not so sure about taking the headset off a150 super, big-ish job! Try testing all the wires to the horn for continuity while getting someone to rev the throttle,, (the engine should shouldn't to be running to do this at first, if you can't find the fault that way, the try with the engine running) especially look at any wire touching the throttle mechanism in the hane bars, I would remove the speedo or front light to see if any wires are moving!
Good luck

Mij ☺

[mijapxman]

Been thinking more about this.
You may get the correct answer, quicker using the guys on the "modern vespa forum", the "not so modern" section, they are a bunch of good knowledgeable guys and I believe a few have/had 150 supers.

Plz remember to introduce yourself in the correct section first, it's only polite if your asking for help. Not a dig at you, just writing it for general consumption.

modernvespa.com/forum/forum19

Mij ☺