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Ok so when i start my car the battery light comes on. we replaced the alternator and the battery but it still comes one. what could be the issue?

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Does it come on for a few seconds and go off or does it stay on because it is normal to stay on for a few seconds.

Posted on Oct 22, 2013

Testimonial: "when i start it, it goes off but comes back on and stays on"

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Posted on Jan 02, 2017

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SOURCE: 86 nissan 300zx

i got the answer for you! in your engine compartment on the passenger side near the battery is a box that has,what lookes like plugs in it. take out the one on the farthest right(on the cover it says BAT) just relpace it or bypass and you will be set! let me know how it works out Parker217@live.ca

Posted on Mar 21, 2009

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SOURCE: 2001 c240 battery/alternator - visit workshop light

This is normally a low voltage from the alternator condition. Hook a voltmeter to the battery and note the reading. Should be 11.6vdc to 12.2vdc. Start the car, after a minute or so it should be around 13 to 14 vdc., if not then the alternator may be bad

Posted on Jan 09, 2010

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Battery light on red.. replaced battery light still on


That battery light is a charging indicator. If the vehicle starts and runs, then the battery can't be the problem. The alternator isn't charging, replace the alternator. Have it tested first to be sure it isn't some other issue, but 99 times of a hundred, it is the alternator that causes that battery light to come on.

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LOOSE GROUND OR LOOSE CONNECTION AT THE ALTERNATOR

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1 Answer

My battery light comes on while driving for about a minute than goes off the alternator and battery are fine i had it checked


The Battery warning light comes on because the Alternator output voltage has fallen below the voltage (about 12.8 volts DC) required to keep the battery charged, this low Alternator voltage causes the light to come on while this condition is happening. In your case unless the Alternator is tested while the battery warning light is on it will test ok/no problem. The battery itself doesn't turn the light on, only the Alternator malfunctioning. I would think you have a part called a "Diode" failing in the alternator or a wiring issue at the alternator connector(s), either way you need to isolate the problem, it will get worse and you will end up with a no start.

Oct 17, 2011 | 2002 Mazda Tribute

1 Answer

Battery light comes on. Had battery tested and it's OK.Checked battery voltage with key off 12.04 volts, started it voltage is 14.45. The light comes on after driving for awhile.


OK, sounds like a bad voltage regulator or loose belt. But, it's more likely a voltage regulator on the alternator that is not supplying enough voltage to the battery over time.

For maximum peace of mind, I would have the alternator replaced if you experience any starting problems attributable to a weak or undercharged battery.

14.45 volts doesn't sound bad to me, for an initial voltage, but there may be a problem with the alternator (like a bad diode trio) , which controls the battery charge light pretty directly.

Oct 28, 2010 | 2000 Ford Expedition

1 Answer

I pulled my van into a friends house yesterday, turned off the engine and then lost power to everywhere. Nothing works anymore and of course won't start up


First off check the fuses under the dash. And make sure battery terminal connections are tight and clean.Check for proper tension (roughly 1/2 inch of deflection) on Alternator belt and that belt is present.Sounds like there is a alternator issue.Did your battery light come on while driving? Have a friend jump start you (follow safe jumpstart procedures or you could damage your friends car or yours ie:Ignition key off,Postive cable goes on first when attaching cables,negative cable comes off first when discconnecting cables. Let charge for 15 min or so before trying to start your vehicle ) If it starts look for a battery light on the dash. If no battery light is on then alternator is probably ok and battery is bad (take it out and have it tested at your local autoparts store). If the light is on then you have an alternator problem.To confirm alternator problem check output voltage across battery terminals. Should be min 13.5-14.5 no more than 14.5 If you have to replace the Alternator make sure battery is good and has a full charge and negative batt. cable is disconnected,if not you could potentially ruin you r new alternator

Jun 10, 2010 | 1983 Ford Econoline

3 Answers

Battery light comes on intermittantly while driving I had the battery tested and alternator everything was fine???Is it safe??


You have an intermitt issue. Test battery voltage when light is on. More than likely alternator (also check the belt that drives it) or poor battery connection (must be clean and tight).

Nov 21, 2009 | 2006 Ford Focus

2 Answers

Battery warning light coming on after a mile , but battery isnt flat and car starts 1st time and lights are ok Car is puegeot partner combi. Stop car and it and it ok for another mile . Battery doesnt seem...


Check your alternator as it sounds like it may be starting to go. The battery light trips when it detects an issue with the charging system. Very rarely, the battery light can trip if there's an issue with the PCM, but this is very rare.

Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be around 12V+-.2. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery properly. If it's above 14V, then it means your alternator is overcharging and damaging the battery.

Oct 21, 2009 | 2005 Peugeot 405

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Car wont start. lights and everything comes on but no crank when I try to start car. been having to start car twice to get it to turn on. 1999 dodge intrepid


Look into the starter motor.

Car is 10 years old and starter motor problem is linked to startup issues in cars. Common issue

May 29, 2009 | 1999 Dodge Intrepid

2 Answers

93 LX 5.0 replaced battery, ran fine then would not start


sounds like you have a good battery, get the car started put a voltmeter to wire connected to the back of your alternator. if you have at least 13.25 volts you have a good unit if any lower replace the alternator
the click sound you are hearing comes from your relay it is getting low voltage from the battery. because the battery has no juice caused by a bad alternator


hope to help shack

Apr 15, 2009 | 1993 Ford Mustang

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