Question about 2003 Mercury Mountaineer

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I have a 2003 Mercury Mountaineer I change the alternator and battery the car cuts off and it flashes real quick on the message center that there's something wrong with the charging system trying to troubleshoot this problem don't know what it could be .

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Disconnect the battery and charge it; then reconnect the battery. There are 2 systems which can cause this. The antitheft and the battery drain protector.

The antitheft can view a very low charge as an attempted theft. The battery drain protector is an automatic shutout for any circuit that is putting too heavy a demand on the Alternator. This feature can actually disconnect a charging system if it is making the Alternator work too hard.

This is why the battery must be fully charged. Since components have gotten flimsy the drain protector is trying to keep the Alternator from overheating.

Other causes for blinking are reversed polarity and relays that are kicking out due to bad contact points. If there is anyway to borrow a scanner, it may identify the defect.

Posted on Mar 29, 2015

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1 Answer

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The flushing could make it worse

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How do you reset the change oil message on a 2007


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Jan 06, 2010 | 2003 Mercury Mountaineer

1 Answer

Changed oil and message center still says oil change required (2002 mercury mountaineer)


Ford Explorer, Mercury Mountaineer, 2002-06

To reset CHANGE OIL SOON/OIL CHANGE REQUIRED message on the Message Center, press the SET UP control to access the System Check mode. Press and release the RESET button to display “OIL LIFE % HOLD RESET NEW” is displayed. Press and hold the RESET button for 2 seconds until “IF NEW OIL HOLD RESET” is displayed. Press and hold RESET button until “OIL LIFE SET TO 100%” is displayed.

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1 Answer

How do i check my charging system for my 2003 Mercury mountaineer


1st check the belt to the alternator. it should be in good condition and free of cracks. twist the belt so you can see the underside to check. if the charge light is on, this is a pretty good indicator that you have a bad alternator. if not get a cheep voltmeter and simply set to d.c. volts and put the leads on the battery terminals. voltage should be over 13.5 but not over 16

May 05, 2009 | 2003 Mercury Mountaineer

1 Answer

2003 mercury mountaineer w rear A/C clicking noise coming from


OMG - I found that same problem last night. Did you have a problem with you door locks and radio afterwards. Today I found my door locks don't work and my radio won't shut off. I am so confused!! I also had my alternator replaced about 1 month ago and the "miles to E" gives me a message of "computing fuel" for a few minutes rather then "miles to E"

Have you found a solution yet?

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2003 mecury mountaineer


Have the alternator tested, perhaps the battery as well. Otherwise, there may be an electrical drain somewhere and that would have to be looked at by someone who knows about vehicle electrical systems. Try the battery and alternator first....

Jan 24, 2009 | 2003 Mercury Mountaineer

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