Question about 2000 Mercury Cougar

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Hi i have changed 2 alternators in my 2000 murcury cougar. Twice the lights have dimmed and the power has died while driving. I checked the wire to the alternator and still nothing what do i do.

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  • Mercury Master
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Have the Battery checked and you may want to replace the Ignition key. If you have Anti-theft or a Remote car starter the problem may be there.

The Alternator needs power to the brushes in order to generate the Big Amps that go to the Battery and run your car. The Keyswitch provides that current to the Alternator. Without the power going TO the Alternator nothing will come out.

However the Ignition can be controlled by the Antitheft system and Remote start. Both can interrupt the power going to the Alternator as well as the Ignition. Check the plug connector going to the Alternator brushes and see if they are getting power or not when the car is running.

Both Autozone and Oreillys will scan your car for free. They may need to do a Diode test to catch the Brushes messing up.
In either case, have the Alternator bench tested before tossing it.

Posted on Sep 27, 2010

  • Brandy
    Brandy Sep 08, 2011

    I am having the same issue....however I have replaced the battery four times,rebuilt the alternator and put two new alternators in the car and it still will not hold a charge. At this point I am putting the car on a charger every night just to drive it aroud 1 to two hours the next day, and during this time I cannot turn on the radio,lights or air conditioner because it drains the battery and that is all I am driving on. The alternator is not charging AT ALL...so don't waste your money on another one. The alternator will ALWAYS test bad on the car...then test perfectly fine off of it. I have done some research and many people are having this issue. Ford has a recall on the battery cable being misrouted but most people have a car conveniently NOT included in it,although it was manufactered during the SAME time. Mine being one of those not included. I did come across someone who replaced the MEGA175BP Main Power Fuse on the cable from the starter to the battery. She said it was broken and would come out causing random electrical issues. I have not tried this yet...as I am still trying to find an exact remedy to the problem....but I am starting to doubt that there even is a fix. I'm just at the point where I do not want to waste anymore money. Only a handful of people have actually kept the car long enough to get this resolved (the girl who replaced the main fuse and others who had loose fuses but not the root of the issue), while others just get rid of it. At this point...all I can say is try the main power fuse and cross your fingers...I'm going to try it as soon as possible.

  • fordexpert Sep 09, 2011

    Hello, Let me know if your fix works. I have not heard back from my client so I guess all is well. There are a couple of things to check. As I wrote a Year ago, the Alternator gets power from the Keyswitch and needs this initial tickle spark to generate current. Also cars with Battery Minder systems can kill the charging circuit. I repeatedly recommended disconnecting the Battery and using an Ohmmeter to find grounded circuits. Most people test the Power side of the problem instead of the Ground side. You need to break the problem down to 2 causes. First you have something draining your system and second, your Alternator is not charging. Both can be going on at the same time. Keep me posted please.

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Go to http://cougarfix.yolasite.com for the answer to your problem

Posted on Oct 11, 2010

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