Question about 2005 Mercury Montego

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I have a 2005 mercury montego and every once in awhile the dash flickers or stops working and then it will start again and the check engine like turns on and stays on. What is causing this????

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Sole it out, n get another 1!

Posted on Mar 26, 2011

  • Jerry Conners Aug 01, 2011

    Go to and register. Once you do that, log in and they have ton's of help. Schematic's, repair info, home delivery for parts.....a great site!!! Good luck! Try it!

  • Giovonni Jun 26, 2012

    Had the same thing happen just the other day as well. Things you can do. Check the battery with a voltage meter and make sure it is being charged by the alternator. If your sure the battery is good. If your not sure take your battery to autozone or something similiar in your area and have it tested. If it is determined the battery is good then the alternator may be intermidently charging only instead of a constant charge. This will cause power failure and all power including air conditioner will stop working. You may also notice that your transmission goes into limp mode. Meaning, It will run sluggish in 1st gear or wont come out of low gear etc. The check engine light will be on and maybe even the transmission light. Remember your car is completely electrical all the computers sensors etc are all electric. If the electric is not fully working from the battery due to the alternator all kinds of things begin to happen. I replaced the alternator with minimal tools. 5/8" deep well socket-Rachet-1 small extension and 1 medium sized extensions. Flat head screwdriver-1/4 inch rachet-elbow grease.
    The alternator was around $140 from autozone, No sense in buying the more expensive one the cheap one the factory installed lasted you this long chances are you wont own this car by the time the next cheap one dies.
    Make sure your in a flat area to work on the car.
    Block the back tires to keep from rolling.
    Remove the positive battery cable.
    Raise the car near the front passenger side.
    Support the car with jack stands Do not support it by the swing arm or A frame find a solid piece of frame.
    Remove the tire.
    There is a wheel well splash shield made of a flexible rubber. You can stretch those over the plastic fasterners without damaging them too much to get that out of your way.
    Now you can clearly see your alternator that is covered by a hard plastic splash shield.
    Carefully wedge the screwdriver under the wire harness fasteners that hold the crank shaft position sensor. This harness is connected by push connectors to the hard plastic splash shiedl in two places.
    With that done reach up and find the positive alternator cable it is the smaller one on the top. It will be held on by a small nut, I believe the nut is a metric cant remember but pretty sure it was metric size. I couldnt reach it with anything but a small closed end wrench myself. remove that wire and push it up out of your way.
    Now be careful not to break the next wire but below that is another control wire. This is held in place with a typical connector that will come off once released. There is a wing on one side of this that needs to be slightly pride open then the connector can be lifted up. Do not apply too much pressure and break this connector it will not be a good thing.
    With all wires out of the way you can start working on removing the alternator itself
    The alternator is held in at 3 points. 1 top 2 bottom. The top will come off as a nut and will leave the stud behind do not try to remove the stud you dont have too.
    The bottom bolt farthest from the wheel will also come off as a nut. The closest bottom bolt will come out as a stud if not thats alright too. With these bolts removed the plastic spash guard can be removed and pushed back into what cavity you have away from you out of the way. Careful when moving these items around that your not stretching or pulling on any wires that can break on you. with this guard out of the way it gives you a little more hand room to reach your rachet up and pull the belt tensioner so that tension is released and the belt can be pulled off the alternator pulley. You may find that the alternator moves too much when doing this then you may decide to put the top nut back on holding it in place then try again. You shouldnt have to get crazy removing the belt just enough to get it off the pulley. It will be very hard to reroute this belt if you remove it from too many pulleys.
    Now you can slide off the alternator from its support studs and remove it. This will be a tight fit and you may find that the best way is to twist the single nut top away from you and with the pulley facing down pull it through the narrow opening just above the rack and pinion steering gear.
    I would suggest leaving the plastic splash guard right where it sits it will not come out of the opening with it still on the alternator you can waste your time trying but there isnt enough clearing for both to come out as one. I had trouble putting the splash guard back on when I pulled it out and thought I was going to put it back in with the new alternator in place. Bad mistake I had to cut away some of the plastic to accomplish this but I sure wasnt going to wrestle everything back apart just to get this splash guard back on. So moral of the story leave the splash guard in the cavity and replace the alternator then slide it back into position. Make sure you do not overtorque the nuts this is after all aluminum your working with and you will certainly strip the threads if you man crush it down.
    Reconnect all wiring and fasteners and flexible splash guards and your all set.
    Charge your battery to full charge before attempting to start the car. Drive the car for about 20 minutes or the time it takes you to return your alternator core to autozone for your $35 core charge. Dont worry about the check engine lights after the motor runs for a while I found that they cleared themselves. If not then run it to a shop and have them clear the codes for you. Total time changing out alternator with slight experience 4 hours. Total casualties on scratch on my arm and a cut index finger. Good luck hope this helps.



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