I have a friend who has a trickle charger for his boat. It's plugged into a switched exterior gfci receptacle. He wants to know if it is bad to leave the charger hooked up and plugged in and turn the switch off to the receptacle. He thinks the current will drain back out of the charger if not disconnected ( I guess like water). I would think it would be perfectly fine but would like to confirm. I've heard stranger things.
Thank you
Thank you