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Would you please post the serial number of the engine?
Which scanner are you using?
This is a beeping tone and not a solid horn correct?
When the engine stalls, what do you need to do to get it to restart?
Check on the left side of the engine and see if there is a fuse in the red wires going to the voltage regulator. Make sure that it is good.
With the horn sounding and you getting RPM reduction, there is a code going off, just your scanner is not able to pick it up.
With the engine off, it you connect the scanner and provide power to the connections on it, look at fault history, is there anything shown there at all?