The horns take a high current with no relay, so are very dependent on excellent connections.
The terminals at the horns themselves are susceptible to corrosion because of their exposed position, and the connection and rubbing carbon contact inside the steering wheel hub is another weak point.
One overlooked point is the steering column universal joints. These have to take the earth return. There is supposed to be a coiled link-wire between each pair of clamp bolts. Often omitted, this can make a big difference to horn performance if all else fails.
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