There are a number of things that will do it.
Problem is, I don't remember what the sequences are in order to diagnose the problem.
This isn't correct but will give you some idea.
A long steady horn may be overheating,
intermittent beeps at idle or certain speeds may be a low oil indicator (or pressure) or even low fuel pressure.
You need to remember the type of horn beeps and when it was doing it in order to narrow the problem down.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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