This afternoon one engine alarm started a constent beeping, checked drive oil, oil pressure and water temp. and press. all good. hooked up scan tool and all it said was Gen Alarm # 1. any ideas?

Is it a mercruiser scan tool where you can check oil pressure, water temp etc, not just at the guages?

The alarm's for drive oil level, water temp, oil pressure and volts.

Mine did it years ago to the original owner and on my test drive. He said that nobody could figure it out. Shut it down and restart and everything's back to normal. On my inspection I found a loose (barely) ground (bat cable) at a junction block. Tightened it and alarm has never gone off since. That was in 2004. On the test drive the boat did 93MPH. 92 was all he'd ever gotton out of it before.

Good luck

It is a Mercruiser scan tool and it shows water temp., volts, and servral other items but not oil press. I switched drive reservoirs checked grounds, no good. Is their a chart that shows general alarms?