It didn't work this morning
.
So I went home to "repair" it.
Got al my tools out and was ready to tear the complete steering column to parts.
I wired the grey wire on the horn relay directly to ground and the horn sounded, so the relay was OK.
Then I tried the horn button, and guess: that worked too
.
So I went to the inspection and they filled in the paperwork (they did the other testing yesterday already) and was out in five minutes.
I'm good for another year!
Tonite I re-crimped the spade connectors on the relay and put a little WD40 on them.