An electrically-powered accessory for vehicles includes a vehicle structure. A connector mechanically connects an electrically-powered accessory to vehicle structure. The connector includes a movable lock member that mechanically locks the electrically-powered accessory to the vehicle structure when the movable lock member is in a locked position. The movable lock member causes the electrically-powered accessory to be electrically connected to an electrical power supply of the vehicle when the movable lock member is in the locked position, and electrically disconnects the electrically-powered accessory from the vehicle power supply when the movable lock member is in the unlocked position.