2005 Mountaineer--Oct. power windows and radio quit working. soon after check engine light came on. brought to dealership. they said it was fuel pump(?0 and fuse. Didn't agree but 1000 dollar

Question edited for clarity.
Question moved to model category.

The check engine light alerts you that you have a problem that needs attention and then you connect a code reader scan tool and it gives you numbers. Those number tell the problem and how to fix. They are called DTCs (Diagnostic Trouble Codes). Garages will normally read the codes for you for free in the hope of getting the work. Or you can get a cheap code reader yourself.

I have the FIXD scanner which sends the information to an app on my smartphone.

https://www.google.com/search?q=fixd+scanner&

DTC Codes

https://www.google.com/search?q=2005+Mercury+Mountaineer+DTC+codes

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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 ...

get a meter and test for a short

Could be a blocked fuel filter, or a fuel pump on the way out, If you can't do it your self get it serviced.

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 ?

Thats pretty wild. The a/c and power windows are on different circuits.
The only thing I can think of that everything would be connected to is the ignition switch.

Initially look at the fuses. The windows will have their own fuse and the radio may work on the same fuse as the gauges. The fuses must be in the main fuse box. The position and function of the fuses is normally marked on the inside of the fuse box cover and also in the owner's handbook. If you don't come right with these, work your way through the fuses looking for a blown ones. A small pair of pliers will ease removal of the fuses.

Check Fuse 2.3 (20 Amp). See electrical diagram below.

When it goes, it'll take out the audio and "Cluster and Panel Illumination."
(assuming your vehicle doesn't have an OEM Nav system - in which case fuse 2.3 would
supply power to the Nav system).

Fuse 2.3 is located in the CJB (Central Junction Box) - not the BJB (Battery Junction Box),
nor the AJB (Auxiliary Junction Box).

Also, check fuses F1.6 (60 Amp), and fuse F1.62 (30 Amp) in BJB (Battery Junction Box).
Also, check fuse F2.17 (15 Amp) and the "Accessory Delay Relay," both in the CJB (Central
Junction Box).





Here's the electrical diagram for 2005 Mercury Mountaineer Power Windows:
Note how fuses F1.6, F1.62, F2.17, and 'Accessory Delay Relay" will all
disable the power windows.

the first thing to do is go to your fuse box to see if there are blown fuses i won't comment on your statement however hope this helps regards Jim