Your alternator is shot.
A slight possibility but not likely
The battery group is 65N for a 2003 Ford Windstar
Then either something is on draining the battery or the battery has a dead cell draining all the rest and must be replaced.
Ok i have replaced the battery and two alternators and replaceds the rear hatch light switch. still when i connect a light between the negitive battery post light comes on. Power continues to drain the battery over 4 days its dead. Why is it still draining? If you have checked every single light on the vehicle and none of them are on draining the battery it is more than likely a relay that is stuck. Check every relay in the vehicle.
A short will not drain the battery it will blow a fuse. It may be the battery has a dead cell, or some light is on draining the battery. It can also be a stuck relay.
Something is on draining your battery overnight. Any light or any relay. It can also be your battery has a dead cell draining it overnight.
1995 Ford Winstar still wi.ll not start after changing starter. Now power going to it. What can be done?
On the Ford Windstar 2001 model, it is under the hood, next to the battery.
There is a circuit live somewhere.
Open the hood and look see.
Are the battery wires corroded? If they are, they may not be getting a good connection.
Had the same problem. Bought a re-conditioned alternator, turned out it was bad. Usually if battery draining, it's alternator or battery or both.