Question about 2000 Ford Focus

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Battery light is on. lights dim at when driving

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  • 162 Answers

How long this poblem ,? next thing that show you that your alternatror is no charging , when the light come on, or a belt could be burst

Posted on Aug 02, 2010

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Posted on Jan 02, 2017

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RonPark
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SOURCE: issue with dash lights dimming while driving,

If the battery and alternator tested fine. I would have the charging system rechecked when engine is hot and at high rpm's. This way the checks are being done as if you were driving and driving for a long time. Alternators can work fine when cold but weaken when hot or stop working. This problem is not rare but only is seen occassionly. Unless it was checked at an electrical shop the average shop doesn't run these tests for they don't see the problem often enough to automaticly run them at all times. Good luck and let me know how you make out.

Posted on Sep 21, 2009

01fordeb
  • 1033 Answers

SOURCE: DASH LIGHTS DIMMED, HEAD LIGHT DIMMED, THEN THE

Sounds like the alternator output is low. Not enough output to charge the battery. Your local advance auto store can check this for free to be sure. It could be the battery not holding a charge like it should. Check it first with Adavance

Posted on Jan 01, 2010

motor1258
  • 6674 Answers

SOURCE: battery keeps draining.car was driving and then

Make sure all connections are clean and tight, belt is good and have alternator (charging circuits) checked. Sounds like alternator may be defective.

Posted on Jun 10, 2011

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The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
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Dim lights while driving means your car is running off the battery and the alternator is shot, which is why it's hard to start and the lights go dim, you drain the battery while driving and the alternator is not charging it back up.

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Lights are dimming, gauges are zeroing out while i'm driving. Could this be my alternator? Because car has new battery and starter.


If your battery is charge indicator light does not come on and battery is holding charge after a couple days of driving it is unlikely your alternator is faulty.
If the lights are dimming on youe meter cluster only, it could be a bad connector to the meter cluster.
If your head light are dimming it could be a bad battery connection or the alternator.

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1 Answer

Issue with dash lights dimming while driving,


If the battery and alternator tested fine. I would have the charging system rechecked when engine is hot and at high rpm's. This way the checks are being done as if you were driving and driving for a long time. Alternators can work fine when cold but weaken when hot or stop working. This problem is not rare but only is seen occassionly. Unless it was checked at an electrical shop the average shop doesn't run these tests for they don't see the problem often enough to automaticly run them at all times. Good luck and let me know how you make out.

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Lights dim while driving


Have your charging system checked. I had a similar problem with a chrysler van - the lights would brighten and then dim periodically. it turned out to be the battery.

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