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Fitted a Stebel Nautilus a few weeks ago (what a horn) everything ok today used for2/3 secods and it stayed on. Had to stop and pull off the cable. The feed is now live all the time even with the ignition off.. I can only think that the relay has fused together causing feed to horn all the time .. Will investigate when I can get the tank off.. Any other thoughts please.. RR

If you can easily get to the wires on both sides of the relay, you can bridge them to see if that's the problem...if breaking the bridge, breaks the circuit, then the relay is bad and you may need a heftier relay.

Good move that I will try first. Probably a cheep Italian relay!! I will try a larger type of a more Tuetonic make perhaps.. RR