Welcome to the site,
Check your shift interrupter, mine is located just behind the carb, mine did the same thing a couple of years ago and I found it to be that. It had unplugged itself so I plugged it back together and put a stay strap on it.
What kind of motor is in yours?
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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