Stuck Horn

I went out to start my SV this morning to go to my first day at my new job, and I turn the key to "on", and the horn turns on and wont go off . I think ive heard of this happening..but dont know the cause. I can't really drive with the horn blaring, nor can I without a horn. Ideas? thanks

you have checked that some funny person has not stuck the horn button with tape/glue?!?

[dirtydog]

i woiuld just un plug it and fit some twin fiamms at the weekend

This is a FIAMM. Not the stock horn. The button is fine. Is there a relay that could have broken?

Ok, I checked out some wiring diagrams....no relay. Maybe just a bad button.

I think the horn button is an earth to the frame (it completes the circuit). Maybe the horn has got itself earthed? Otherwise it's either a horn button problem or a wiring problem (earthing against the frame).

Originally Posted by Eagle747

I think the horn button is an earth to the frame (it completes the circuit). Maybe the horn has got itself earthed? Otherwise it's either a horn button problem or a wiring problem (earthing against the frame).

Correct. The horn wiring is negatively switched (meaning that all the button does is to earth the circuit, it's already got a positive feed).

Easy way to test a bad earth, would be to unplug the horn, stick a multi-meter in the connection that goes to the switch, the other multi-meter probe on the frame... do you get continuity? If you do, you have a dodgy earth somewhere.

Originally Posted by Baph

Correct. The horn wiring is negatively switched (meaning that all the button does is to earth the circuit, it's already got a positive feed).

Easy way to test a bad earth, would be to unplug the horn, stick a multi-meter in the connection that goes to the switch, the other multi-meter probe on the frame... do you get continuity? If you do, you have a dodgy earth somewhere.

Unless the problem is inside the horn itself! i.e. the windings..... You can get a new decent one for a tenner anyway. But Baph's excellent technical suggestion is good!

Originally Posted by Baph

Correct. The horn wiring is negatively switched (meaning that all the button does is to earth the circuit, it's already got a positive feed).

Easy way to test a bad earth, would be to unplug the horn, stick a multi-meter in the connection that goes to the switch, the other multi-meter probe on the frame... do you get continuity? If you do, you have a dodgy earth somewhere.

Thanks. I will try that as soon as I get home.

Stuck Horn? Cold Shower

HTH

(Since you seem to have sooo many sensible suggestions