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Having an issue with my Starlet P7 horn. The horn works when wired to a positive and negative of the battery but when I plug it into the car nothing happens. I checked the earth, fuse,wiring and changed the switch assembly behind the steering. It didn't solve the problem. Any ideas? 

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The horn on steering wheels normally just work when the earthed. 

make sure the earth connection is good on steering column 

The horn itself has a power supply and bracket is earthed to the body of the car.

hope that helps



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I thought it was the aftermarket steering wheel causing it, so changed back to the oem wheel and problem still occurred. 

So I tired wiring it up separately to a 4 pin relay but the relay clicks but no horn and when I earth the horn on the body its on constant. Maybe I done it wrong. Would one of the two connections on the horn button be an earth? 


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