Quote:
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).
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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.