Question about 2000 Mercury Cougar

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Got a 2000 Cougar that has a charging problem, new alternator new battery, but kill the battery again, check the fuse on the cable thats connected to alternator its good, so charge the battery by jumping it and run idle a for while and all the guages shut down the engine down but when you have the booster cable it stays running with battery light, check all the fuses look good.

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THE SAME THING HAPPENED TO MINE. AFTER $400 I REALIZED IT WAS THE FUSE WHICH IS CONNECTED TO THE ALTERNATOR. IT WAS BROKEN AND WOULD COME LOOSE AT ANY SLIGHT BUMP, THEN IMMEDIATELY KILL THE BATTERY. FIRST THE RADIO WENT OUT THEN THE DASH LIGHTS. ANYWAY I GOT A NEW ONE FOR $40 AND PROBLEM SOLVED. =]

Posted on Jun 16, 2010

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  • hunting_grem Sep 08, 2011

    a fuse for $40???? where is this magical fuse that people keep talking about? i replaced the 7.5 amp fuse that was supposed to connect to the alternator, but i keep finding sites saying something about a fuse...like...behind the engine?!?! where is it

  • Brandy
    Brandy Sep 13, 2011

    the mega fuse is under the ignition coil.....you have to take that off and then you take off the fuse housing. you will need a 1/2 long socket (long enough for spark plugs) to get to it.

  • Brandy
    Brandy Sep 13, 2011

    @hunting_grem- email me: pixierice822@hotmail.com
    i want to see if you are having the same issues with your cougar as me.

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Had the same problem. it ended up being the pigtail wire, the red wire end had opened up so it wasnt touching the contact

Posted on Dec 01, 2014

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Two things you have to double check:

a) Is this the correct battery for this vehicle
b) Is this the correct alternator for this vehicle

If you answered yes then move onto the next item:
c) Are battery cables in good condition.
d) Are the wires from the rear of the alternator in good condition. (no corrosion , or looseness)
e) while the car is running with the charger off put a voltmeter( digital) on the battery and see how many volts it puts out with and without accessories on.
Gotta be between 13.5 volts to 14.5 volts. If no its the alternator. Remember as long as this is the correct battery and alternator for this vehicle. Its gotta be one of the items I've told you about. My experience with this vehicle is the wiring off the alternator.

Posted on May 03, 2010

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