Question about 1999 Mercury Cougar

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BATTERY LIGHTS FLICKER WHEN I REV UP THE ENGINE

WHY DOES MY BATTERY LIGHT FLICKER WHEN I AM STARTING OFF OR WHEN I REV UP THE ENGINE

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  • hgalaviz71 Dec 06, 2008

    inner dome lights and any electrical lightining equipment flickers

  • Anonymous Mar 23, 2014

    dash lights flicker and engine quits

  • Anonymous Mar 29, 2014

    headlights flicker while driving,flashing battery light on console.

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  • 303 Answers

Sounds like your belt is slipping, check your belt.You need to check alternator, it may have a lazy regulator.

Posted on Nov 24, 2008

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Posted on Jan 02, 2017

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Porsche boxster 2004 headlights and side lights front and rear flicker first thing in a morning when auto choke on. Soon as engine dies down lights are fine for the rest of the day. Tried new light switch...


That's an interesting problem. When you say "flicker" are they flickering on and off, or just dimming a bit? My guess is that it's a problem with the voltage regulator on the alternator, or a problem with the alternator. Could also be a weak or bad battery, but I think you would have problems starting the car too. Check your fuse panel too to be sure they're all in there tight. If one is loose and rattling it could cause an issue like you describe.

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hello sir

if the lights flicker and the motor doesn't start you have a dead battery. If everything works alright and the lights just flicker, It's the excited gas hog anticipating sucking up more gas winking at you.

thanking u

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All the lights,radio, and other electrical feautres in my car work before starting it but after starting all of them flicker car goes in and out and engine has a high screeching sound this just happened...


Yeah could be a slipping alternator belt by the sound of it. The lights might just be on, because the car hasn't had a chance to idle properly to run diagnostics. Check and/or have the belt replaced.

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It sounds as a weak battery. Try to horn with the head light on to see if it can sound.
1- Have the battery recharged.
2- Clean off the cable terminal really well to prevent corrosion built up causing high resistance. If there is high resistance at terminals, there is not enough current flowing through the starter hence there is no starting.
3- If battery is good after recharged as well as horn could sound, but still not started, then the starter solenoid needs to be checked out. Good luck.

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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.

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