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I have a 2009 Suzuki Alto which I have had from new. The horn has stopped working. The fuse is OK because it also protects the hazard warning lights which are working. I changed the horn but it still does not work. I took it to a garage who said they could not find a fault but suggested I take it to an auto electrical specialist. Before I do this, which will probably be expensive, can anyone suggest where the fault may possibly lie.
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break out the multimeter, it could be the horn button, relay, corroded wiring or other wiring issues somewhere.

Don't just throw parts at it, diagnose it properly.

do you have volts at the horn wire with button pressed? work back from there until you find the issue. Can e something as simple as a bad connection, like not cleaning paint off the horn bracket so it has a decent earth.
 
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