I have a 1991 Mercury 115 outboard (white lettering, red, grey and white stripes). I have distinct warning noise coming from the throttle (beep, beep, beep). I was out on a lake this past Sunday and everything was fine all morning. Then, I started heading back to the dock in the early afternoon and after about 30 seconds, I started hearing the warning noise. I turned the motor off, let it sit for awhile, tried it again and same thing... beep, beep, beep. I even hear the noise when I just turn the key a quarter before starting up the engine. I haven't looked at anything in particular yet. FYI I did have a similar noise a few weeks ago, but it was not as clear of a beep, beep, beep. It was kinda muffled or inconsistent. It sounded like a noise you might hear if there was a bad connection in the electrical wiring. I only heard that noise when accelerated to get up on a plane. Once on the plane, the noise went away. I realized I was getting low on oil, so I filled up the oil reservoir in the motor and I didn't hear that noise again. I'm wondering if if someone can help with the noise I have now, maybe give me a checklist of things to look at or test. Thanks in advance for your help!