2000 Ford Expedition Battery

It could be a weak battery, or there could be a draw on the system. I need you to check for a draw. I will assume at this point that the alternator light hasn't come on.

Here is the how to for checking for a draw.

https://www.2carpros.com/first_things/why_is_my_car_battery_dead_over_night.htm

Also, here is the how to for checking the battery:

https://www.2carpros.com/how_to/battery.htm

One final thing, the alternator. If the battery is good and there is no draw on the system, check the alt. Here is the how to:

https://www.2carpros.com/how_to/how_to_test_alternator.htm

Check these things and let me know what you find.

Joe