Trolling Motor Plug (male) connects to the trolling motor. Jumper internally to supply 12V and 24V power to the trolling motor when plugged into the receptacle. The 4-wire trolling/charging system eliminates the need for a charge/run switch. Install the receptacle on the boat, mount the black plug on the trolling motor and the red plug on the leads of the battery charger. Simply connect the black plug to troll or the red plug to charge.