I have a brand new battery an alternator but the battery still goes dead on a 2001 ford explorer?

I have a brand new battery an alternator but the battery still goes dead on a 2001 ford explorer?!

Then you have a short. You'll have to find out what's draining the battery

Measure the voltage at the battery with it running you should have at least 13.7 volts if so then your charging system is Ok and means you have something draining the battery. Until it gets fixed removing the battery cable for the night is easier that jump starting every day.

Excessive parasite draw, Defective Voltage Regulator, or as simple as a loose drive belt.