My boat gives me little hints that something is wrong before completely stopping to function. I’m just a little slow at realizing it. It happened again today when the onboard charger stopped working. It happened to be a heavy duty switch from the AC main to the charger. Two days ago it was buzzing minutely when the charger was running, like a fluorescent light. Today I had the service manager and tech aboard to eliminate all the possibilities, coming back to the switch. They connected both leads to one post and ordered a new switch.