The 1999 Mercedes-Benz horn relay switch can be found on the drivers side front quarter panel. The horn relay switch will be behind the headlight assembly.
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chech the fuze on the right part of the engine there is this thing with cables no.6 should be for the horn
see if theres any current going through the fuse or just replace the whole horn
I'm sorry if this sounds silly, but did you put the battery in backwards?
You have to determine the cause first. Check the horn switch and contacts, fuse, relay and the horn itself.
The horn itself has failed The horn contacts/switches on steering wheel are dirty or broken The horn relay has failed The horn circuit fuse blew Wiring and or connections are corroded or broken
sohunds like you have a short on the horn botton, you only have a hot wire, so when you push the horn botton it make a gorund to make the horn sound