Question about 2000 Mercury Cougar

2 Answers

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.

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mercury Master
  • 5,522 Answers

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 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 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.


  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

Go to for the answer to your problem

Posted on Oct 11, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I just replaced the alternator in my 2000 V6 Mercury Cougar, but now, for some reason my battery light is on and my power steering is out. HELP!?

I wondering if you tensioned the belt correctly and does the same belt drive both units, Have you reconnected the little wires into the back of the alternator as well as the heavy wire

Feb 22, 2013 | 2000 Mercury Cougar

2 Answers

Alterator on 2000 mercury cougar putting out almost 17v

Yes it could have a bad or busted wire some where gonna have to ohm it out

Nov 30, 2012 | 2000 Mercury Cougar

2 Answers

Alternator tests good, but lights flicker dim, and wont charge battery

take a test light and check your fuses , make sure both sides of the fuse is hot ! check power at alternator if no power gos in no power will come out.

Sep 12, 2012 | 2000 Mercury Cougar

1 Answer

1994 Plymouth Acclaim 2.5, 4 cyl won't start

on the backside of the alternator there should be a large black/grey wire. check to see if there is battery voltage on that wire. If there is not than you have a blown fusible link that is inbetween that wire and the battery. If there is power there than check for power on the dark green with dark blue wire. There should be power anytime the engine is running. If there is no power than there is a problem with that wire in between the alternator and the ASD relay.

Check those two out and let me know what you find.

Feb 09, 2012 | Plymouth Acclaim Cars & Trucks

2 Answers

Battery light stays on 2000 mercury cougar with v6 engine battery light stays on

Your alternator isn't putting 14 volts out to the battery. Check the stator wire on the alternator and the 3 wire plug make sure there is no gap on any of the alternator connectors and they are on VERY firm!

Hook up a multimeter inside your car and watch the battery voltage! if under 14volt you got an alternator problem!

Jan 08, 2010 | 2000 Mercury Cougar

1 Answer

My cars engine, battery, and oil lights are on. HELP!

well when the car shuts off or stalls your check engine , oil . battery lights are all going to come on the oil light is telling you there is no oil pressure due to the car not running the battery light is going to come on due to the alternator not pushing any juice because the car is not running and the check engine light also now. check under the car and make sure that your moter did not cut,rip or fray any wires comming from the starter area. this could be a big problem and make lights flicker and the car to run funny.

Jan 05, 2010 | 2000 Mercury Cougar

3 Answers

My 2000 Mercury Cougar starts ok then after a few minutes the dash gages drop to zero then starts to struggle to keep running then dies and will not restart unless I charge the battery. I was told maybe...

check fuses alternator fuse ,charge fuse.also if that checks out look at the harness for back of alternator is it in bad shape? is there a large wire by it self bolted on the alternator? if so take a wire ,same size,and bolt it on with that wire and run it directley to the positive battery post this will charge battery for now on,but if u dont have a large wire bolted on alternator ,the larger wire that is pluged into the alternator is the same wire ,tie into this wire really good and do the same (run to battery positive post) make sure this plug in is good ,if not u can purchase this at the zone

Jul 04, 2009 | 2000 Mercury Cougar

Not finding what you are looking for?
2000 Mercury Cougar Logo

333 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts


Level 3 Expert

76164 Answers


Level 3 Expert

5522 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides