No windows, radio, gauges, auto lights

Fuses?

Fuse box location and diagrams: Mercury Mountaineer (2002 ...

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Mercury Mountaineer (2002-2005) fuses and relays

Fuse-Box.info https://fuse-box.info > mercury > mercury-mountainee...

The fuse box is located under the instrument panel on the driver's side. The location of the fuses in the passenger compartment: Mercury Mountaineer (2002-2005 ...

Does the radio turn off if the passenger door is opened?

Get your OBD Codes & Google them & read up

In the mean time-- stop using it

cud be a bad fuse--there are some in engine area too--may hav to test each one----a flaw in the wiring also--or a module that controls the diffrent functions------aquire a service manual or a private shop is best direction

Dead Battery ?

Your ignition starter is bad.

This should be a warranty issue, go back and complain, nicely.

CHECK BATTERY CABLES AND FOR CORROSION,A BAD GROUND OR BAD CONNECTION WILL CREATE ENOUGH RESISTANCE TO PREVENT STARTER TO CRANK OVER ENGINE. IF BATTERY HAS 12V DOESN'T MEAN IT'S GOOD,IT COULD HAVE ON 100 CCA'S, NOT ENOUGH.

Check fuse 17(15amp) in the interior fuse panel.

Have the battery tested, perhaps the alternator also. I had the same problem on my 2005 Taurus ( also a Ford / Mercury product ). I replaced the alternator easy enough, and a full charge on the battery solved the problem. The vehicles are designed to shut down unnecessary or non-vital accessories first, as to prevent a major shutdown on the road. So your lights and signals will still work, but the rest of the electrical will power down to conserve the battery.

You can get the battery tested at most service stations or you can buy a tester at any auto parts store. Some of them will test it for free.

Hope this helps.