milligan

Monterey 280 SCR, Mercruiser 390 - I lost a circuit which is includes the engine hatch, radio, garman, horn, windshield wiper, windlass etc. Anyone know where to check for breaker that controls all of those?

I have a Monterrey 280 SCR with two carbon monoxide detectors, one in the salon, and one in the main bunk. They both go off at any time, even when the boat is not running. They went off yesterday when the boat had been sitting idle for 30 days. Any suggestions on what might be doing this. The are hard wired - no battery.