Question about 2003 Mercury Mountaineer

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Major Power Problem with 03 Mountaineer Premier

On a very cold nite( about 8 degrees) I turned the key and noticed that the automatic headlight switch wasn't working.  Then i noticed that the instrument panel guages, interior lights, sunroof, SRS, radio, info center, power windows, garage door opener, etc didn't work either.  Thank GOD the heat and blower fan still works!  Any ideas?  Power distribution block looks good.  Is there one fuse or relay that provides power to so many things?  Oh and things that still work are: directionals, hazards, horn, power mirrors, and power locks
Thanks, tONE!

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  • tonebeats Feb 06, 2009

    First up, 

    Thanks KETOLACA for the quick response!  I checked the batt & charging sys & all was well, so I took
    it to the dealer.  

    They told me that that my instrument panel cluster was bad and caused the power loss. I guess there is a resettable circuit breaker that powers the optional accessories.

     Ford has issued a service bulletin which says that if you unplug the cluster, plug it back in, and the power is restored, the cluster is bad.

    This probably applies to explorers and aviators as well.

    Hope this info is helpful and saves some of you a bill from the dealer. lol


  • Anonymous Mar 30, 2014

    passanger air bag indicatou light not working automatic door lock switches not working rear defrost not working all fuses and relays good and reset ecm what else could it be



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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.

Posted on Jan 27, 2009


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