are you talking about unplugging the touch panel inside the coach? if so, unplug it again, and remove the white cover on back of the plug. with a knife blade, press down on each wire within the plug. this tightens the wires within the press in connections. its worth a try. the power for the system is fuses located down by the pump. also there are fuses within the control box mounted on the end of the pump. download a service manual if the plug repair doesnt work. there is no substitute for a service manual. get the ml35963 manual, thats the one for your system.