2002 Ford Windstar Disconnect Battery Put On Charger Every Night Teh Morning Try

i have to disconnect the battery and put it on the battery charger every night if not then in teh morning when i try to start the van it just clicks . i can jump start it and it will start right up during the day the van drives just fine most days with no issues , but as soon as i have to use my headlights wipers or heat the van lights will either dim or blink off and on. now the back slider door dummy light is saying the the door is open and it is not hte car acts as thoe the door is open as in the dome lights dont stay on and the radio either.