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.

Nov 08, 2015 | AC Cars & Trucks

1 Answer

Today my battery light in the dash come on and for a Little bit when u idle the engine up the light would go off but when idle dwn it come back on i cleaned the batterg terminals ck the water in battery...

You've got a bad alternator. At idle it was not charging but at higher speeds it was still able to charge some. It blew a diode.
Your battery died because it was not being charged.
You should have 12.5 volts on a charged battery with the engine not running. It should not drop below maybe 10volts when cranking and should read around 14volts when running if your alternator is working.

Sep 22, 2017 | Cars & Trucks

1 Answer

Blower speed problem after replacing battery...

The blower speed shouldn't increase, as that switch only opens and closes the fresh air door. It sounds' like it increases, as the act of closing the fresh air door amplifies the sound of the fan inside the vehicle.

Jul 10, 2012 | 2006 Jeep Grand Cherokee

1 Answer

Engine temperature coolant sensor

Your description indicates the engine/coolant thermostat is faulty and allowing at least some coolant to continue circulating so at higher road speeds the engine is over cooled.

Apr 03, 2017 | 2003 Jaguar S-Type

1 Answer

1999 Ford Contour engine light is on. Engine light came on for second time today. Reset this a few months ago and it seemed to be fine until today. The car seems to run fine at this time. Both times...

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.

Nov 03, 2011 | 1999 Ford Contour

1 Answer

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.

Apr 05, 2011 | Nissan Altima Cars & Trucks

1 Answer

2001 Ford F150 battery light comes on at running speeds, but will go off at idel. Battery hand shows charging. Battery and alternator test good.

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

Nov 17, 2009 | 2004 Ford F150

1 Answer

Service engine light -- on then off, then on, then off

If it's the check engine light, I'd look at the radiator for partial internal obstruction...In colder temps or running at speed it tends to run a bit cooler. RPM change may be computer attempting to compensate for this. I'm not a KIA expert, but this applies to any vehicle. Also check your coolant level. If it's low it will also act this way.

Mar 31, 2009 | 2003 Kia Sorento

1 Answer

Engine light and battery light come on at same time and speed up

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!

Jan 26, 2009 | 1991 Buick LeSabre

2 Answers

Battery light blinking

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

Jan 09, 2009 | 2001 Ford Expedition

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