2005 Mercury Mountaineer Advance Trac light is staying on

Fuses?

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

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Mercury Mountaineer (2002-2005) fuses and relays

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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 ...

Remove relay #49 in the under hood power distribution box, if the lights go out then tap the relay on the ground and plug it back in, if the lights stay off then replace the relay. Attached is a link to your owners manual refer to page 182 of the pdf for the location of the high beam relay. http://www.fordservicecontent.com/Ford_Content/catalog/owner_guides/04mntog3e.pdf

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download

Christina, May just be a loose Tone ring, plug/wire,wheel speed sensor, etc. You will have to take vehicle into a good shop and have scanned for diagnostic codes to determine which sensor,wire,etc is bad and causing the advance track light to display and estimate repair. Check the attached links,instruction and guides, Good luck
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Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download

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If you can get to an Autozone, Advance, or Oreilys parts store when this defect occurs, they will scan your car for free.

The Check light will identify some of the defects.

You current issue is no different than any other
vehicle problem you have had since 1996 when
the OBD2 Systems came into being

You have a MIL Lamp on or check light as some people
call it

You should have checked fore codes immediately within a day
or so to at least know the codes & then googled them to get
some idea of the issues

You know that you have an ABS Braking System issue based on
your owners manual & your abiltiy to recognize Advance Trac etc

Have to have a shop diagnose that system with professional tools

With an AWD issue possible I wouldn't even use it until fixed

The trac control is ussually a bad wheel speed sensor or related
issue

Mercury Mountaineer 2002 2005 Factory Service SHop repair manual Download


for better result download the pdf file

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