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Changed alternator,and the battery light is still staying on,why.

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  • Cars & Trucks Master
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Get the battery tested at a car battery testing place it will tell you if battery is crook or alternator is crook.

Posted on Dec 06, 2014


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Posted on Jan 02, 2017

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SOURCE: battery light stays on.

If it was not integrated into the alternator, the voltage regulator may have failed.  I don't know where it is located in your car but if it is external, you may be able to find it by following the smallest gauge wire attached to the alternator backward. They are generally connected with 'quick-disconnect' crimped-on connectors.

Posted on Nov 04, 2008

  • 255 Answers

SOURCE: brake light stays on

check the E brake make sure it is disengaged then make sure there is fluid in the mastersylinder resevour if you are talking about the brake lights on the back of the car check the switch on the pedal under the dash

Posted on Aug 14, 2009

  • 708 Answers

SOURCE: battery light in dash will not turn off

you may have to reset the computer. you can do this by unhooking the battery for about 30 minutes or go to a auto parts store and theyhave a scanner that can reset it with the push of a button

Posted on Oct 07, 2009

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2003 bmw x5 4.4 battery light stays on

Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

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1 Answer

Alternator and battery changed

You my need to have the alternator looked at again to see if it's charging you also have to look at the fuse for the alternator it may be blown. Also check the check the plug that goes to the back of the alternator make sure it is in all the way.

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I have a 2004 Eddie Bauer expedition the charge light started comin on then truck ended up dying bought new battery charge light stayed on then not even 5 hours it was dead again changed alternator and the...

Have someone check the charging system on the truck. The light comes on when the alternator is not charging the battery.
Could be a wiring problem between the alternator and the battery.

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The battery and brake light stays on. could it be the alternator?

Thanks for choosing FixYa and welcome. It may be, persuming you are speaking of the dash lights. Start the vehicle and pull the hot side battery post. If it dies instantly, your alternator needs changed. Inspect the wires on the alternator to be 100% positive.

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the battery wont stay charged? if youre putting in a fully charged battery and your car runs, but then the battery slowly dies, the problem will be your alternator. the alternator is what maintains a car batteries charge. try replacing the alternator. hope this helps.

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dear friend-it sounds to me that your vehicle is only running on battery power.i believe you alternator is not charging as it charges threw the light when it is of,have the alternator tested

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Battery and brake indicator light stays on after start

When the lights are on check the battery voltage. Should be 13.0 to 14.5. If you unplug the connector on the alternator when the lights are on, do they go off?

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Mazda Mpv 2000 I also have the same problem, the alternater is testing good- 14.12Amp, so what is the problem the battery light will not go off.

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