2005 mountaineer is dead even with new battery

All about parasitic draw. Check for a light in the trunk or under the hood. Also the dome light is easy to miss in the daylight.

https://www.fixya.com/cars/r29903527-parasitic_draw_car_batteries

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May have either a bad switch assembly or a bad window motor,
The system will need to be diagnosed.

you have a current drain, have it diagnosed then get rid of the caddy

No one can tell why,it has to be checked
for codes & diagnosed as with all vehicle
issues

I could say you may have one or more bad ignition coils
as they are common on your engine,but still have to test
many things to see what does work correctly,the other
things that don't will show up 90% of the time

A mechanic would check for voltage at the battery, then the cables, then voltage at the starter. The starter gets voltage from the battery and from the key switch to energize the solenoid.
Fords need at least 10.5 volts and 200 amps to crank the starter. A battery can have a dead cell and show 12 volts but no cranking amps.

sounds like a faulty ignition switch. alot of electrical things are connected to that switch, so when it starts to go they act up.

If the vehicle sit for a period of time, even over night and it won't start with the new battery and alternator, you have a dead short drawing voltage from the battery until it goes dead. Disconnect the positive terminal from the battery and connect a test light to the cable and touch the battery positive post with the other end of the tester. If the tester lights up, you have a draw on the battery causing it to go dead. Now you need to pull 1 fuse at a time while the tester is connected to see when the light goes out. When it dies, that is the circuit that needs to be traced to find the faulty switch, bard wire or whatever is the cause. Good luck.

Hi there. why did you replace the previous battery ? did you have the same problem. if so your car have develop a electrical problem and need it diagnosed at your local auto electrical workshop or have the alarm system checked.

whoever replaced da battery didnt dew a good electrical inspection-i think your alternator is failing but 1st chec for loose or dirty wires-gauges help out alot-the battery shouldnt be dead overnite