Charging system problems99 mercury villiager asb light comes on and starts to fliker than other warning lights start flickering and head lights get very dim. turen off car sometimes will start other times need jump

CHECK OR HAVE SOMEONE CHECK BRAKE FLUID LEVEL, BE SURE PARKING BRAKE IS NOT ON!

Diagnosing Common Automotive Charging System Problems

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Sep 18, 2013 - Flickering gauges. ... Problem: The charge indicator light flickers while driving. .... My alternator has been replaced for the third time in 5 months. ... I bought a new regulator but it is still doing the same thing... .... my headlights wont turn on, car runs fine when jumped, battery last for maybe 3 hours, any ideas ...

All lights Flickering/Pulsating only when motor is running ...

www.cadillacforums.com/forums/cadillac-forum/t-221843.html

Feb 11, 2011 - So i have noticed for a while now that all my interior lighting (radio, tach, even ... Installed the battery and have not had issues starting since then. ... So now ipurchased a new alternator "just in case" figuring i would eliminate the .... Interior lights and headlights still seem to pulse/flicker while idling the most, ...

Lights Flickered. Replaced Alternator. Now more flicker? - Camaro ...

www.camarozone.com/.../lights-flickered-replaced-alternator-now-more-...

Apr 22, 2013 - 20 posts - ‎4 authors

Two possible reason, your parking brake is applied or the switch defective , Fluid level low or switch defective.

Your battery is not charged and gets drained constantly, dome lights doesn't take much voltage to be lit. Get a voltmeter and check on the battery. Engine off it should be all charged up and 12V ish. Try to start your engine, should be 13-14v charging, if not, then it is your alternator not charging or SOMEHOW your battery doesn't receive enough charging from the alternator.
When you turn on the headlight while engine is running and died off because the alternator some how couldn't supply enough current to power both headlights and motor ignition system
Get your alternator tested, before that all connections between alternator and battery is NOT LOOSE, or broken or damaged. Then go to auto electrician. Then sort out your fuses later.

Much like the check engine light, you would need to use a scanner to clear the codes from the body computer once the problem that turned on the warning lights was fixed. As long as the problem exists the lights will stay on.
You could try disconnecting the battery for an hour, but the engine computer will have to re-learn the basic settings for the engine when you start it.

Those are all really common symptoms of the alternator going bad on those cars. I would have it checked to make sure it's charging properly.

This sometimes is triggered by the MAF(Mass Air Flow Sensor), try cleaning it with the highest percent isoproply alcohal first, do not touch the sensor with anything use a big bag to soak it into, or just replace the sensor.

Did you have the altenator replaced trying to correct this problem? Many times altenator probems will affect warning lights and gauges, at this point, most customers can't remember if the charge light was on because "all of the warning lights were on". Sometimes a faulty altenator can feed A/C current into the vehicles electrical system. I would be interested in the solution to this problem as soon as it is resolved...good luck.

Check the battery and charging system. Most auto parts retailers will check it for you.

Have you checked any of the wiring circuits?