Question about 2001 Ford Focus

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Problem with battery light coming on at higher speeds i replaced battery today but the light is still coming on what could this be????

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I believe that you may have a bad regulator within your alternator......

Posted on Jul 16, 2009

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Battery light is on when idleing, but when i accelerate battery light goes out


Two things can make the bat light come on at idle but go off above idle.
The belt could be slipping because it is not tight, or glazed, or the alternator could be defective.
Once the engine starts, the alternator should be making enough current to "turn the light off". The light is grounded thru the alternator until it is charging, which reverses that circuit and kills the ground source for the light.
If you are sure the belt is ok, I would have the alternator bench tested, because usually if the belt is slipping it slips more at higher speeds.

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A possible culprit could be your O2 sensor (Oxygen sensor in the exhaust manifod or piping). These are usually good for about 80K to 100K miles. When they fail or start to deviate too far from their baseline readings they can cause the check engine light to come on. Driving on the highway at higher speeds would result in higher exhaust temperatures than typically are encountered during in- town driving so this could explain why it only occurs on at higher speeds (which equal higher engine loads of course). You could buy an engine code checker or take it to a shop and have them read the error codes for you to narrow it down and/or confirm my O2 sensor idea.

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I have a 1988 Nissan Altima with 186,000 miles. When I started the car today the battery light an brake light came on and didn't go off when I tok the car out of park. I drove 1 mile and pulled over to...


Sounds like you have a broken belt that runs the alternator. Usually when the battery and brake lights come on it means the alternator isn't charging. Either that or the alternator burnt up.

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verify the belt tension-er is staying tight and not floppy around at higher RPMS,or the belt is not slipping ,have the alternator checked at higher RPMS not at an idle.the last is make sure the single wire little wire connector is tight

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1 Answer

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You need to Check the Belt and Belt Tensioner. If the Tensioner is not keeping the Belt Tight it will not allow the Battery to Charge and will result in the Lights among other Critical Things Going Wrong. Please Rate my Response, I need all the Help I can get! Thanks!

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check the battery connection it might be corroded or loose also your might check your alternator this mostly causing battery discharge

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