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Why do you need the alarm anyway for an outboard?
The only reason I would want an audible alarm to sound is if I owned an inboard or an I/O to remind me to run the blower motor to clear any fumes before I start the motor.
My 40 Merc has a beep when I turn the key but I don't know what it's use is?
Don't think I'd miss it if it no longer beeped.
The alarm is to let you know if the motor is overheating. So therefore I would like to hear the beeping when I start the engine.